Science topic

Weight Loss - Science topic

Weight Loss are decrease in existing BODY WEIGHT.
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Dear colleagues,
May I ask, What are the most important factors that affect the feeling of hunger?
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Physiological and behavioral factors, gastrointestinal factors, disease-associated factors, and environmental factors that initiate the hunger center can affect the feeling of hunger.
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I got the mass lost data and temperature already, but the lab assistant did not take the same amount of samples, so the curves don't start from the same origin which difficult to compare them. Now, I want to change the data of mass to weight percentage.
thank you
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I fully agree with Dr Philippe Tailhades, as the analisis of TGa curves are based on the loss weight percentage do you need to build the TGA curves in weight percentage to be able to compare
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in ionic liquids when i test it with TGA analysis under N2 gas at 500 C the weight loss % was not logical (more than 100%) =108 % ؟؟؟؟
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Yes almost certainly an experimental error. However, I would bet on the weighing procedure as the more likely problem. Specifically, since most ionic liquids are hygroscopic, I suspect some weight - in the form of condensed water - was added accidentally after the sample was weighed.
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I am performing a static immersion test using artificial saliva for Co-Cr base alloy. For weight loss measurement, I need to remove the corrosion product from the sample surface. Please suggest which chemical to use to remove corrosion products.
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I suggest you to have a look at the following regulation: ASTM G1-Standard Practices for Preparing,Cleaning, and Evaluation of Corrosion Test Specimens.
My best regards, Pierluigi Traverso.
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Good day.
I've modified surface of my clay sample with iron. After the process my samples LOI in XRF analysis increased from 6.73% to 18.73%. Later, i've performed TGA analysis for this sample but weight loss was around 6%.
Can anyone please tell me that which one (LOI or TGA) is a more accurate indicator for the sample's thermal stability? And why the difference between two results are so high?
Thanks in advance.
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Dear Osman Uygun ,
there are three aspects, which have to be considered:
a)Ppenetration depth of your 'surface modification with iron' in your sample;
it might be surface near in the range of a few µm; but I do not know, what you have really done.
b) Penetration depth/information of XRF analysis;
this is in the range of a few 10µm; thus covering the depth of your surface modification, but covers not the whole sample thickness.
c) Information depth of TGA; I think, this is equal to the complete thickness of your sample, which I suppose to be in the mm range. So with TGA you will get a result averaged over the whole sample. Any modification of the sample close to the surface will not significantly affect the averaged result.
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Oxidative enzyme such as (Catalase - SOD and GSH
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Many studies reported that an elevation in oxidative stress process is associated with weight gain but also in multiple organ dysfunction, especially liver and kidney. Here's the links of some interesting articles:
Best wishes,
Sabri
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In TGA of polymers, initial small weight loss (10%) is due to moisture. No matter what I do to avoid moisture, the loss is still there. How to get rid of it?
I have done heating the sample in an oven for prolonged periods followed by placing it ( polymer sample inside the ziplock airtight bag) in a vacuum desiccator with silica gel.
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Samples acquires moisture relatively very quick. So even it you heat it in an oven and place it in an airtight bag, it get its bound moisture within a short span of time.
We generally keep the sample in TGA at around 50 - 70 deg. for 15 to 20 min for the weight to stabilize. Then we can start the ramp up of heat for the thermal analysis. If your polymer is thermally stable till around 100 deg., then you can keep the sample in TGA at around 80 to 90 deg. instead of 50 - 70 deg.
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Dose it seems that; Once-weekly, high-dose semaglutide is superior for weight loss in patients with T2D compared with daily injectable liraglutide at its approved dose
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Also check please the following useful RG link:
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Dear collogues,
May I ask, What are the best natural herbs for obesity management?
Thanks
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Dear,
In context of a planned research program on obesity prevention, we would like to invite obesity and weight loss support groups from several European groups as consultants. These are not always easy to find, do any of you have contacts or links to such organisations? This would give a more patient centered profile for entire project.
Regards.
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Sodium glucose co-transport 2 (SGLT2) inhibitors are relatively new drugs included in the management of type 2 diabetes over the recent decade. These agents lower blood glucose by inhibiting glucose reabsorption in the proximal renal tubules. SGLT2 inhibitors also have some other effects such as weight reduction. Does weight-reducing effect of SGLT2 inhibitors among patients with type 2 diabetes constitutes a therapeutic significance.
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My results in conducting the biodegradation study on a certain plastic all had 0% weight loss. What should my p-value be?
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The values of the observations being zeroes are not an issue. Your issue here is the sample size. You need a larger sample size. Check this out:
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How to analyse this combine TG-DSC curve. I can find only one weight loss step? how to interpret this graph. This is done for my ferrite sample calcinated at 600 degrees celsius.
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I totally agree with Dr Emanuel Cooper . it seems to me that there is a partial reduction of you ferrite cations on 800-900 degrees. I would also say that the first endotherm is related to water and small organic molecules.
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I am working on graphene nanoplatelets (GNP) and polymer composites. The thermogravimetric data if GNP shows a three-step weight loss when heated up to 900 C (please look at the attached curve). I have concerned about the second and the third weight loss. can anyone share their knowledge on this process?
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The "first step" is the loss of adsorbed water (either by the sample or ... by the crucible). It ends below 100 C. (By the way, it would be nice for you to see the baseline of the device, I suspect that you did not take it into account). Significant weight loss - at about 440 C and 840 C (I assume that the experiment was in the air media? You did not specify the conditions). If you extended the experiment upto 1100-1200 (and any device allows it), you would see a plateau, in this case, complete oxidation of the substance. Two steps are most likely oxidizing of two fractions of what you call graphene ... There is a significant share of graphite or soot. In my experiments, graphene also oxidized at about 440 C, and graphite exhibits a higher oxidation temperature (should I explain why?).
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The experimental results are obtained by pin on disc test for MMC
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I am not sure but may I suggest that plowing may cause a burr to form on the edge of the wear scar. This displaced material is the product of wear and contributes to the wear volume measurements but since it remains attached to the test specimen, it doesn't affect weight loss.
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Please see the attached image. With increasing temperature it is show the gaining weight..
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I understand that electrochemical techniques are performed under a controlled environment in the laboratory. Whereas, weight loss measurements contribute to more of a real case environment. Mostly, the results (corrosion rate) obtained from both weight loss and electrochemical methods verify each other. However, sometimes the results (corrosion rates) obtained from weight loss methods do not match the results obtained from electrochemical methods. Why such contradictions?
Note: By results here I meant the trend in change of corrosion rates. Not their values.
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As per my views, the corrosion rate obtained from the electrochemical test is based on the flat (no slope) region that we chose in the anodic and cathodic parts of the curve to draw tangents. Even a small variation in site selection leads to a significant difference in corrosion rate. Whereas, corrosion rate obtained from the weight loss method gives a confident measure of corrosion rate as weight loss is a universal measurement. So, I would recommend weight loss as the more suitable method for corrosion rate measurement.
Whereas, the major benefit with electrochemical corrosion is the quantified value of corrosion potential which is definitely a more reliable, non-mathematical, and instantaneous measure of corrosion resistance.
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We have measured over time the weight loss, disease symptoms (weight loss; stool consistency, rectal prolapse, rectal bleeding; spine curvature) and colon histological changes (leukocyte infiltration, goblet cell depletion, epithelial hyperplasia, crypt size, and submucosal inflammation and ulceration) after H&E staining in 2% DSS treated 8–12-week-old C57bl6/j mouse. Colon histological changes have been studied at day 8, the point of higher weight loss before weight recovery (DSS for 5 days+3 days of water).
We have compared a control group versus our group of study (Study-group).
After independently repeating the experiments several times, we have consistently observed:
-no differences in weight loss overtime between groups
-statistically significant REDUCTION of disease symptoms in the study group
-but significant INCREASE in colon histological damage in the study group (particularly in leukocyte infiltration, goblet cell depletion, crypt damage and ulcerations).
It is well stablished the correlation between disease symptoms and colon histological damage, but we have not observed this effect this time.
Could you help me to explain this discrepancy?
What could be the mechanisms related to these two different effects?
Do you know any reference in the literature explaining this potential contradictory results?
Attending to our results, do you think that our study group is suffering from less or increased IBD?
For the interest of the IBD in patients, is it more important to reduce the symptomatology or improve the tissue damage? How could we study these two points in our model? Any recommendation?
Thank you
Sincerely
Jose Maria
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I forget to mention that our study group also showed a large colon lengh, a symptom of reduced colitis.
In summary, our study group showed the same weigh loss, less disease symptoms and increased colon lengh but worse colon histology.
Than you
Sincerely
Jose Maria
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During TGA analysis of the concrete sample, the weight loss (H2O, Ca(OH)2, and CaCO3) at different temperature range is observed.
How we can calculate the bound water loss from that analysis? Can anyone able to provide the example sheet of this bound water calculation analysis?
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As a suggestion, I can say that the different components in TGA analysis are eliminated at different temperatures. The mass release for water, Ca(OH)2 and CaCO3 will be different. Particularly, the attention in water should be centered around 100°C. In this case, you will see a peak around this temperature in the derivative of the mass loss. By knowing the amount of the sample used (in grams for example) and knowing the % change of the sample at his particular temperature, you can calculate how much water was released.
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I have a TGA curve which showed that my UiO-66 is completely converted to ZrO2 at around 530 degrees, I just need to know how to calculate the weight loss ratio.
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Vianney Andrew Yiga TG graph can be presnted as mass plotted against temperature or mass loss plotted agaainst temperature. If you plot mass vs. temperature, it starts from 100%. It, in fact, presents residual mass plotted against temperature. But if you really mean, mass loss, it should start from 0%. Please check my previous answer again carefully.
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Hi,
Here I attached TGA test results of DGEBA based expoy.
What was the reason to have such a weight drop?
Thank you,
Janitha
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Dear Janitha,
There are two events occurring at 330.81 and 515.28 deg C.DGEBA is a symmetrical molecule and has high stability, but also it is an organic bulky molecule, hence the energy required to break DGEBA maybe substantially higher as compared to conventional organic compounds but also lower than inorganic substances. This means at 330.81deg C , there is a weight loss(probably due to cleaving and elimination at the phenylpropan2-yl region ) and the second event at 515.28 deg C because of elimination of the oxiran group.
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I have performed TGA_DSC of cement paste with different clays. Samples 1-4 showed similar total weight loss and DSC curves, but samples 5 and 6 showed less weight loss.
As all the samples have similar compositions (determined from XRD), what could be the reason for different weight loss for samples 5 and 6?
For samples 1 to 4, 50 mg weight is used whereas for samples 5 & 6, 35 mg weight is used for doing TGA. Can this be a reason for the above change?
thanks
saurabh
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It is important to have a representative sample size when conducting TGA analysis of cementitious or other multi-phase materials. At NIST, we generally tried to use our large volume TGA pans and get a sample size close to or exceeding 100 mg.
Also, results often depend on from which temperature you are measuring your final weight loss. In your figure 7, one can observe that already by 100 C, when the sample should be losing mostly free water, samples 5 and 6 have much less mass loss than those of 1-4. Perhaps these samples were allowed to "dry out" more prior to being loaded into the DSC. You can try renormalizing your mass loss results using the 100 C masses of each specimen as the new basis. This should definitely get rid of some of the variability between specimens.
Regarding the heat flow plot, it would be better to plot the y-axis as heat flow per unit mass as otherwise it is difficult to compare the various curves.
From the mass loss curves, the mass loss between 400 C and 500 C is usually attributed to water lost from calcium hydroxide and while it is difficult to tell exactly from viewing the curves, the six specimens appear to have fairly similar absolute mass losses between 400 and 500 C. This would suggest that the free water loss (prior to 100 C) may indeed be biasing the subsequent cumulative mass loss curves and normalizing based on the mass measured at 100 C may be a good way to go.
Good luck,
Dale
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During TGA, the sample mass taken for the analysis may lead to a shift in the operating temperature. How did you overcome this problem while calculating the weight loss of the Nano-composites?
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Hi Shashi, I confirm the answer of Mahmood M. Barbooti, thats exactly correct..
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I am working on the corrosive effect of food condiments juices on some selected metals using weight loss experiment. But while plotting the graph, I found out that the decrease in corrosion rate is not uniform as it has to increase at some point before decreasing again. What may be responsible for this flunctuations
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observing the graph you can see the fluctuations you focus on… personally I am more concerned about the corrosion speed of the materials and therefore the release of metals in food condiment juices.
I would be very curious to carry out a surface analysis (morphological and, if possible, also chemical) of the corroded materials. This would allow us to hypothesize something more realistic, also not knowing exactly the characteristics of the "corrosive solution" (pH, conductivity, density, dissolved oxygen, speed of diffusion of the same, etc.).
Looking at the surface of the material, once cleaned in a not too aggressive way, it could be verified that there is no presence of pitting and / or any flakes / agglomerates of product that could generate phenomena related to crevice corrosion. These two types of corrosion could generate surface damage phenomena with an irregular trend over time.
The diffusion of oxygen in the "corrosive solution" may also not be constant over time and give rise to non-linear trends. I don't argue about the experimental part; naturally you will have respected standard procedures both for exposure and for the measurement of weight losses ... if you have done so and you still have the samples available you can check for any localized corrosion phenomena with a microscope (... or a simple lens; after 30 days of exposure the attacks should be visible even at low magnification.
For the sake of scruple, I point out the ASTM G31-72 Standard Practice for Laboratory Immersion Corrosion Testing of Metals or you can find others to adapt to your purposes.
Good work and my best regards, Pierluigi Traverso
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its a silicone based soft denture lining material(polydimethylsiloxane) with 3 triaminomethylsiloxane ionic liquid. please explain in detail the difference between the control and experimental groups.
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I have a dietary intervention experiments on diet-induced obesity animal model and the results demonstrated that the intervention reduced body weight and fat mass and increased lean mass with statistical significance.
Although weight loss ≥ 5% is considered meaningful, what percentage changes in fat mass and lean mass is known as clinically meaningful?
If you have answer for this question, please also provide the reference so that I can cite it in my paper.
Thank you!
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Agree with Mousa Numan Ahmad .
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In TGA curve I am getting 2 step decomposition in which the 1st one coming around 185 to 195 degree centigrade. The weight loss calculated is not matching with the constituent present. Its a metal organic inorganic hybrid. According to the molecular formula and weight it should be 20% loss in 1st step, so I can say one of the ligand is lost at this temperature, but if I am getting 10% loss there. plz suggest me how to interpret that.
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It ran in Nitrogen, Is there any chance of formation of NiO?
as I studied that metal salt taken if present in the product will decompose in that range and it's basically NiO.
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For weight loss we really something want which is high in vitamins and minerals and Vitamins and minerals are not available in all types of whole grains. But yes, you can try brown rice which is popular for weight loss. It is a bowl of whole-grain rice with only the hull removed, thus the fats between the remaining layers cause it to spoil more easily than white, and this rice has been milled and stripped of all its layers and nutrients. It is good for overall health. This is only the variety you must switch if you want to lose weight. Moreover, it is full of dietary fiber which boosts your metabolism. In your weight loss journey, you can add khichdi which is the healthiest way to use rice for weight loss.
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It depends on quantity of consumption. Low consumption of carbohydrates affect body weight.
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I am interested in aero-engine applications where majority of parts are manufactured by titanium and inconel alloys.
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Yes
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After using the pickling inhibitor, the total weight loss decreased a lot, but in first 5 seconds, too much bubbles generated and need an additive to prevent or decrease it.
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Dear Dr.
If possible, add potassium hydroxide in a ratio of 0.07 M. to 0.35M and have the best results.
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What science says about weight loss pills?
Is the body shaming is big reason behind good market for such pills?
Kindly enlisted the reasons why market of these pills is increasing day by day.
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There is a thin line between what is termed medicine and poison. Every pill has contradictions but pharmaceutical companies shields these just to be in business. There are lots of other ways to lose weight . Exploit it
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Hi, i am working on solution combustion synthesis of Y3Al5O12 powders with different oxidizer to fuel ratio. I would like to know if higher weight loss signifies lower combustion temperature? And also what does the higher derivative weight from DTG (higher as in peaks moved towards negative value) means?
Thank you.
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Dear all,
Thank you for the explanations.
However, i am still a bit confuse with the TGA/DTG analysis. Are you referring to total weight loss or just weight loss at region where combustion occurs? What does the higher derivative weight (DTG) loss signify?
I have attached two of my result files here. According to your explanation, which materials have higher combustion temperature? @Mahmood H. M.
Thank you for helping.
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In TGA, as the temperature increases the weight changes, but in a specific material I got a decrease in temperature with weight loss a specific range as shown in the picture, what can be the possible reason.
However, In case of other materials no such problem occurs.
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I think this could be happen due to the instrumental problem or impurities from used crucible to run the sample. To overcome the problem, platinum crucible should be washed properly and then re-run the sample.
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I do some experiments to study the influence of wear testing parameters on the weight loss of AZ91 magnesium alloy which was developed via rotary die-equal channel angular pressing (RD-ECAP) method through the different number of passes.
Please explain how the refinement of Mg17Al12 phase influences the wear properties.
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In the wear phenomena, the size, morphology, volume fraction, and uniform distribution of second phases as well as their connectivity with matrix are most important.
the finer second phases, the more wear resistance. sometimes, the particles can act as lubricant when they are detached from the matrix. these detached particles can contact with the wear disk directly and decrease the lost of weight.
However, In some case, specially at high load regime, the irregular particles with sharp edge can plough the matrix and affect negatively on wear resistance.
about the Mg17Al12 in AZ91 Mg alloy, it can be said that a high content of aluminum in the AZ91 alloy is connected with a significant fraction of the β-Mg17Al12 phase, which is continuously distributed along grain boundaries.
The microstructure of the AZ91 alloy after ageing of the supersaturated solid solution (T6 conditions) is characterized by the presence of fine, plate-like, discontinuous Gama precipitates.
Chen et al [2017] have reported that the T6 treatment improved the wear resistance further, resulting from the high density dispersed fine β-phase precipitation in the α-Mg matrix, which enhanced the alloy strength and hardness and decreased the subsurface metal deformation degree caused by friction.
You can read this paper " Effects of heat treatment on the wear behavior of surfacing AZ91 magnesium alloy "
Best regards
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1). Is leptin, adiponectin, cortisol, apart from insulin, HbA1c worth measuring in weight loss trial pre and post trial only ?
2). And if it is performed as a repeated measure along a trial for how long would you need to follow a subject in a trial to say it is worth to repeat leptin, adiponectin, or the suggested measures ?
3). Especially what are leptin, adiponectin indicatiors like: are there any kind of changes in fat tissue volume ? (visceral fat or subdermal fat ?)
4). Would you recommend in a shorter trial minimum of 12 weeks to have these measures collected only pre and post trial (and as asked how often would it be worth to collect these along a 1 year trial) ? 
5). Is there a massive variation in leptin and adiponectin levels (so should it be collected more than 1 time to estimate somebodies actual value) ? - 5b). Can you give a reference for how to do this ?
6). Can you please indicate hallmark article which describe when these should be measured and what are these indicating really ?
MOST important:
Is there anybody who is interested in being /acting as an external advisor for multicenter RCTs with conditions to be discussed ?
If so please write on: bujpet{AaT]yahoo.co.uk
many thanks,
Peter
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Yes. leptin work against weight loss
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Can somebody share a procedure for calculation of Arrhenius constant for devolatilisation from the TGA weight loss curve from constant heating rate of coal particles?
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You ca use this method. we used it identify the thermal degradation of polyethylene-chitosan blend. It is a simple method. You can just use excel to find the value of Arhenius constant and Activation Energy.
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We are interested in evaluating a corrosion inhibitor at 120 C in 1M HCl. Can anyone suggest the experimental setup for weight loss experiments to be performed at this temperature? We are facing issues with the condensing of HCl vapors from inhibited medium and water from the bath.
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Kindly help me to analysis my TGA weight loss % graph up to to 800 degree weight loss is decreases whereas after 800 degree weight loss increases. can some help me to understand.
Thanks in advance
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Dear Sivalingam Dinesh,
Would you please determine the type of materials that have been tested, and is it possible to attached the TGA graph?
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Weight loss and metabolic switching are the effects of intermittent fasting. It helps in improvements of glucose regulation, blood pressure, brain health, psychiartic and neurodegenerative disorders. What could be the best intermittent fasting regimen to get it's maximum health benefit?
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I followed weekly fasting for many years. Now I am 74 year-old and therefore, I usually avoid my dinner to keep me in good health.I am very energetic and doing all my work.
If one eats more boiled vegetables, fresh seasonal fruits, nuts than deeply fried and fatty foods, health will be good.Further, I advise that dinner must be completed by 7 PM before going to bed at 10 PM.
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I wanted to know what happens if a healthy individual will take high protein diet for weight reduction. Are there any risks to his kidneys in this process.
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With normal kidney function, excess protein does not impact kidney function. In those with diabetes, metabolic syndrome, hypertension, on certain meds. for hypertension or the elderly, excess protein may be harmful. Plant-based protein is safer than animal protein in terms of the nitrogen load to the liver (and important for those with chronic liver disease) and kidneys. Protein is key to body organ repair and for satiety; skimping on protein may not serve the body's best needs. Beans and corn together constitute a complete protein when meat is a metabolic danger.
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Water is considered now as good solution to many diseases,and here are benifits of water,
  • Adult humans are 60 percent water, and our blood is 90 percent water.
  • There is no universally agreed quantity of water that must be consumed daily.
  • Water is essential for the kidneys and other bodily functions.
  • When dehydrated, the skin can become more vulnerable to skin disorders and wrinkling.
  • Drinking water instead of soda can help with weight loss.
  • so how to consider water as good as drug?
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As prevention of some health problems such over weighting, diabetic, Gastric, nephritic syndromes and dyspepsia the warm clean water without medicine has perfect affect.
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In the clinical world, GLP1 agonists and SGLT2 inhibitors are not commonly co-prescribed, though given the benefit of weight loss, cardiovascular benefits, and blood glucose control in patients with insulin resistance as well as obesity, should this be more commonly used? Thank you!
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Thank you!
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People with HIV/AIDS are affected by Weight loss and many malnutrition problems. also their energy expenditure is higher than the normal peoples. what are the nutrition advice for them to be at good health.
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He/she need foods supporting their immune systems, including:
  • Blueberries.
  • Turmeric.
  • Dark chocolate
  • Oily fish.
  • Broccoli.
  • Sweet potatoes.
  • Spinach.
  • Ginger.
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I recorded a TGA thermogram for an organic compound under nitrogen atmosphere. It's melting point is around 200 ℃, but after 320 ℃ I am observing negative mass loss. How can I sort it out.
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1. Be sure about the calibration of the TGA instrument, specially weight calibration.
2. Increase the weight of the sample.
3. put the sample in the oven before starting the TGA analysis (One of the reason that causes negative mass loss is absorption of humidity in the sample).
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I am working on Ionic liquids based membrane.When I analyzed my samples using TGA, my initial weight loss starts from 98% of one sample and from 97% of other sample. How can I interpret this result?
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Hydrophobic samples can retain nonpolar solvents that volatilize at low temperatures.
I suggest that you use slow heating rate, 1 or 2 °C. min-1 to monitor the effect of mass loss.
Check the calibration of the thermobalance with the manufacturer's standard weights and the coefficients of the calibration curve.
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Metaanalysis of prospective epidemiologic studies.
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Kindly see the following RG links and PDF attachments.
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Warm water therapy (actually luke warm water mixed with/without lemon juice, salt etc) is becoming very popular among health-maniac netizens especially aiming to weight loss and to cure/manage diabetes, arthritis, and many other diseases.
Would you please highlight on the scientific rationale, if any, behind it. Or......it is more of a misdirected propaganda!
With regards......
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Consuming hot water won’t make someone lose weight, but it does help the process. taking warm water empty fire up your metabolism, which gives the body the ability to burn more calories throughout the day. It also clears out your intestines to prevent bloating in the body, thus getting rid of excess water weight one may be carrying. It is therapeutically used for musculoskeletal disorders such as arthritis, ankylosing spondylitis, or spinal cord injuries and in patients suffering burns, spasticity, stroke or paralysis.
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Regarding patients considering plastic surgery body contouring after massive weight loss?
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Thanks for the information
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People in attempt of losing weight always experience weight cycling: the repetitions of losing and gaining weight multiple times through their lives, or the so-called “Yo-Yo Effect”. What do you think are the causes of Yo-Yo Effect, and how to overcome them?
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Although restriction of diet often results in initial weight loss, more than 80 per cent of obese dieters fail to maintain their reduced weight. Obese people may regain weight after dieting due to hormonal changes.
It means that even though our weight is reduced, hunger hormones persist to be released in a way by which individual gain weight again.
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Excess weight is a serious concern worldwide which prones the individual to several complications like heart diseases and strokes, high blood pressure, diabetes, certain types of cancer, kidney disease, sleep apnea and fatty liver disease to list as few. According to WHO, more than 1.9 billion adults aged 18 years and older were overweight in 2016, of which over 650 million adults were obese. According to you, what are some of the most effective exercises, diet plan and herbs that can aid in weight loss?
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I personally think those who are overweight or obese are deprived of fibre and complex carbohydrates in their diets. Moreover, they mainly focus on taking only simple sugars and carbohydrates in their diet. Adding a good amount of fruits and raw vegetables will increase the fibre as well as will be full of antioxidants which will help them from certain diseases. Where as intake of Vitamin C in our diets is highly recommended for better immunity. Fibre provides us with satiety and will therefore, elongate the transit time of next meal.
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There are lots of misconceptions about obesity, and its relation to diseases. The so called obesity epidemic is overblown, as a 2006 Scientific American paper stated:
Obesity is not life threatening, and it is not necessary leading to illness.
In dealing with obesity, it is important to distinguish morbid obesity from non-morbid obesity.
The most prominent cause of obesity is infectious diseases and inflammation, and the term infectobesity was coined by Dr. Nikhil V. Dhurandhar in 2001:
The up-regulated autophagy (xenophagy) triggered by infectious diseases turns the eliminated pathogens and dysfunctional cell components into nutrition and energy, which contributed to obesity. So obesity is a side effect of our body’s protective reaction to illness.
Obesity is normally measured by BMI. Yet, the big contributor to BMI is the subcutaneous fat, which is protective and normally harmless. But one relatively small component of the obesity, the excessive visceral fat and ectopic fat that surround the organs or enter the organ tissues, are very dangerous, which contributes to morbid obesity, and is associated with numerous diseases.
To get rid of the ectopic fats that surround the organs or enter the organ tissues, so as to avoid morbid obesity, daily regular time restrictive eating is efficient, and one still can live a long and healthy life by doing so:
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Health policy, education policy etc. in every country should now include active promotion of healthy lifestyle in the media. As part of this policy, informational, educational and activating programs for sports, healthy eating, preventive health check etc. should be finalized from state funds. The governments of countries should consider introducing additional taxation of confectionery enterprises and thus funds for health policy programs could be significantly increased. Obesity is a serious problem that should be taken into account in the current pro-social policies for the promotion of healthy living co-financed from state finance funds.
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Dear All,
Please suggest me well researched herbs or their combinations which have potent  weight loss property. 
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I searched a lot and find most self-efficacy scales are for diabetes or CVD or weight loss, etc. Even the DIET-SE is about low-fat and low-salt, I fail to find a scale only about 'general healthy dietary behavior' without mentioning specific dietary requirements. Does anyone know where can I get the scale? Many thanks.
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Steven Kator Iorfa Thank you for answering. Have a good day.
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While running the TGA instrument, the first runs have shown negative weight from the region of -8% to -40%. But after the first run, the second sample the weight loss is more accurate.
I wonder why, only the first run has this problem, but not from the second run. It would be great to solve this issue.
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Mathew.... To solve instrumental problems, we run some commonly analyzed material and compare the performance. I your case, paraffin wax is an organic compound that may undergo melting and oxidation and hence the thermal records are complex. Try to run calcium oxalate, a well known reference material in thermal analysis, and examine the TG and DTA or DSC plots. If the behavior is OK as reported in the reference books, the problem will not be instrumental. When you said "negative weight loss" did you mean "gain in weight". Gain in weight will definitely refers to oxidation, where the hydrocarbons oxidize acquiring some oxygen to get carboxylic acids. The second run on the material deals with a different material and paraffin wax is no longer exists in the pan. It seems that your nitrogen purging suffers from some leaks and air finds its way to the sample and oxidize it. May you send the TG and DSC plots of the successive runs so that we may be closer to your problem... Good luck...
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We are usually told to take a 15 minutes nap after lunch and a walk after dinner. How long after taking meals one should take a nap or walk? Should we walk briskly or leisurely after meals? Should it be a short walk or a long one? Walk before a meal helps burn more calories or walk after meals? How long should we walk before and after a meal?
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Dear Bisma, maybe the following papers will help you on the subject:
Hijikata Y, Yamada S. Walking just after a meal seems to be more effective for weight loss than waiting for one hour to walk after a meal. Int J Gen Med 2011;4:447-50. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3119587/pdf/ijgm-4-447.pdf
Reynolds AN, Mann JI, Williams S, Venn BJ. Advice to walk after meals is more effective for lowering postprandial glycaemia in type 2 diabetes mellitus than advice that does not specify timing: a randomised crossover study. Diabetologia 2016;59:2572–2578. https://link.springer.com/content/pdf/10.1007%2Fs00125-016-4085-2.pdf
Pahra D, Sharma N, Ghai S, Hajela A, Bhansali S, Bhansali A. Impact of post-meal and one-time daily exercise in patient with type 2 diabetes mellitus: a randomized crossover study. Diabetol Metab Syndr 2017;9:64. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5580296/pdf/13098_2017_Article_263.pdf
Have a good walking day, Martin
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It is said that lemon and warm water reduces the weight in obese person but I could not get its mechanism of action, even after intensive research on the net.
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I done the hydrolytic degradation test for degradable polymer applied for implant. I'm using phosphate buffered saline (PBS) at pH 7. The sample is 3 mm thickness was fully immersed in the solution for 7 month and the weight loss were measured every month. However, there were no weigh loss observed for the samples during 7 month of testing. Is there any specific enzyme that i could used to accelerate the degradation process?
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You should carefully select the degradation solvent or tool to represent your exact microenvironment for your targeted application. My personal opinion you may use the simulated body fluid (SBF) or low concentration of collagenase. It's really essential parameter to look out.
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Hi, I noticed that there are unexpected weight gain on the TGA curve when I ran my sample ( calcium sulphate hemihydrate) whereby there should be weight loss happen due to loss of water. I ran my sample under Nitrogen gas flow; 50mL/min with heating rate of 10degree/min. Can anybody explains why? I've attached the curve obtained. Thank you in advance.
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Follow
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how to convert weight loss to weight loss % in (Thermogravimetric analysis) TGA Data on excel or origin?
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You may find some answers in this review: Franz, M. J., Boucher, J. L., Rutten-Ramos, S., & VanWormer, J. J. (2015). Lifestyle weight-loss intervention outcomes in overweight and obese adults with type 2 diabetes: a systematic review and meta-analysis of randomized clinical trials. Journal of the Academy of Nutrition and Dietetics, 115(9), 1447-1463.
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How significant is OSA in your practice and how aggressively do you manage it?
Apart from CPAP therapy, should weight loss strategies be vigorously followed?- Bariatric surgery/ Liraglutide/other?
CPAP doesnt improve mortality
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The goal in this situation is not only to diminish the apnea/hypopnea index but to avoid systemic comorbidities as carduovascular disease, diabetes or neurocognitive impairment
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Snacks are small-sized foods you eat between meals to overcome hunger, but do they really help you to stick to diet in the long term? And make you lose weight faster?
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Any food you eat more than you need adds to your weight.
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Research published in the Journal of Physiology indicates that ketogenic diets, which are low carbohydrate high fat eating plans that are known to lead to weight loss, may cause an increased risk of Type 2 diabetes in the early stage of the diet. Does anyone know the absolute risk? If you are type II diabetic already what are the consequences?
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Dear Chris,
Maybe the following papers will help you on the subject:
Saslow LR, Daubenmier JJ, Moskowitz JT, Kim S, Murphy EJ, Phinney SD, et al. Twelve-month outcomes of a randomized trial of a moderate-carbohydrate versus very low-carbohydrate diet in overweight adults with type 2 diabetes mellitus or prediabetes. Nutr Diabetes 2017;7(12):304. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5865541/pdf/41387_2017_Article_6.pdf
Saslow LR, Mason AE, Kim S, Goldman V, Ploutz-Snyder R, et al. An online intervention comparing a very low-carbohydrate ketogenic diet and lifestyle recommendations versus a plate method diet in overweight individuals with type 2 diabetes: a randomized controlled trial. J Med Internet Res 2017;19(2):e36. https://www.jmir.org/2017/2/e36/
Brouns F. Overweight and diabetes prevention: is a low-carbohydrate-high-fat diet recommendable? Eur J Nutr 2018;57(4):1301-1312. https://link.springer.com/content/pdf/10.1007%2Fs00394-018-1636-y.pdf
Best wishes from Germany,
Martin
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Steatosis , occurs in more than 50% of patients with chronic hepatitis C, that is related to visceral adiposity and obesity. Moreover, Weight loss in patients with chronic hepatitis C may be associated with a reduction in steatosis and abnormal liver enzymes and an improvement in fibrosis. So my question May weight reduction provide a proper response for treatment of patients with chronic C ?
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Hi,
The following article might answer your query
Impact of Obesity on Treatment of Chronic Hepatitis C . HEPATOLOGY 2006;43:1177-1186.
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In the Renca renal cell tumor model, has anyone observed deaths in control BALB/c mice with moderate tumors (~500 mm^3)? Mice appear to be healthy with no body weight loss but are found dead the next day. Could this be a result of the production of a tumor related factor such as IL-6 or TGF-b? I have asked other investigators using the Renca model and they have not observed this sudden death.
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It is uncommon to observe mortality of mice implanted with RENCA cells but you may notice some drop in body weight. How many cells have you implanted at subcutaneous site? and in which strain of mice have you used?
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Aerospace and space industry has traditionally been a pacemaker for development and introduction of new materials systems and production technologies. The key driving forces for materials development are weight reduction, application-specific performance improvement, and reduced costs. Application of advanced engineering materials has significant impact on both economical and ecological issues. The use of titanium alloys in the aerospace sector are airframe, engine, helicopter, and space applications.
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In Russia, there was a lot of research on the applications of Titanium for aeronautical and aerospace solutions. Below I refer three papers (with direct links) as a guide for other researches. Since these papers are in Russian, translation (try Google as to scan the content) is necessary for material comprehension.
- Ночовная Н.А. (2007). ПЕРСПЕКТИВЫ И ПРОБЛЕМЫ ПРИМЕНЕНИЯ ТИТАНОВЫХ СПЛАВОВ. Авиационные материалы и технологии, (1), 5-9. https://cyberleninka.ru/article/n/perspektivy-i-problemy-primeneniya-titanovyh-splavov
- Антипов В.В. (2017). ПЕРСПЕКТИВЫ РАЗВИТИЯ АЛЮМИНИЕВЫХ, МАГНИЕВЫХ И ТИТАНОВЫХ СПЛАВОВ ДЛЯ ИЗДЕЛИЙ АВИАЦИОННО-КОСМИЧЕСКОЙ ТЕХНИКИ. Авиационные материалы и технологии, (S), 186-194. https://cyberleninka.ru/article/n/perspektivy-razvitiya-alyuminievyh-magnievyh-i-titanovyh-splavov-dlya-izdeliy-aviatsionno-kosmicheskoy-tehniki
- Титов, В. И., Гундобин, Н. В., & Пилипенко, Л. В. (2015). Определение палладия в порошкообразных материалах электротехнических изделий, отработавших свой ресурс. Труды ВИАМ, (1). https://www.viam.ru/public/files/1993/1993-201274.pdf
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Which one out of the them is better for weight loss and related side effects?
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A ketogenic diet is an extremely low carbohydrate diet that is used as a medical treatment in epilepsy and other neurological disorders. A low-carb diet on the other hand side limits carbohydrates such as those found in grains, starchy vegetables and fruit and emphasizes foods high in protein and fat.The ketogenic diet is often confused with a general low-carb diet promoted as a weight loss technique for healthy people, but it is not recommended for the general population.
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for the experimental portion of the study, do we need separate samples or not, so nature of the experiment is non destructive or destructive?
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Common P-EIS[1] is non destructive[2], if you performed a measurement under the conditions:
1) a low Vac(:=1 to 5, mV) amplitudes,
2) a low over-potential stress Vdc(=OCP), and
3) short (stress) measurement time (<near, 1h, or less).
2. you can use the same sample.
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Exercise benefits for health are well known, but what if we're looking for the best way to fat loss, it's really exercise as important as most people think or is kinda overrated??
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Physical exercise is for the health care which by regular walking , swimming , & gyms for Yoga , & systematic breathing steps play an important part for our health care .
In case of person under a heavy weight or a person under a thin body & appearance may take the recourse for reducing over weight or an improvement in the weight for the thin body .
This is my personal opinion
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Hi everyone,
I need to calculate surface coverage (molecule/nm2) of the adsorption of a molecule in a surface? ( I know the number of molecules coverage in a unit surface area and weight loss from TGA data).
Thank you very much!
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In order to calculate the surface coverage, two things are required:
1- The number of the adsorbed molecules, as you mentioned, this can be found that from the TGA result by:
(weight of molecules/molecular weight)* Avogadro number
2- The surface area of the adsorbent, this can be measured by BET method.
The surface coverage is equal to the number of the adsorbed molecules divided by the surface are of the adsorbent. However, it is important to note that this kind of calculations imply an assumption that the a mono layer of molecules is adsorbed on the surface of the adsorbent.
Please note that another methods can be suggested to find the number of the adsorbed molecules and the surface area of the adsorbent, however, the concept of the calculation will be the same.
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My older brother has Down syndrome and has unexplained weight loss over the past year. Bloodwork is all fine. He's been drinking Ensure twice a day and that hasn't led to weight gain. He had an incident where he needed an endoscopy to remove food stuck in his esophagus--was thinking that was part of it. But that was over a month ago and his weight is stubbornly the same.
As a scientist (and sister) I find the situation quite frustrating and would like to educate myself on research in this area, but most of what I can find deals with obesity in DS adults. Appreciate any literature those who study DS for a living can share.
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Manvesh Kumar Sihag
that's a really helpful publication, thank you!
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I am not sure which density value should be used. Density of steel or density of metal coating
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It depends on whether you use anodic or cathodic coating. If both are tight, they corrode. You must use a metal density that corrodes. In the case of corrosion damage, the anode in the galvanic pair undergoes a change, but the determination of the corrosion rate is then more complicated.
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In the high-temperature carbonization of the mixture of zeolite imidazolate framework(ZIF-8/ZIF-67) and heavy metal salts (Pt, Au salts), the ZIF structure will decompose and gas like CH4 will form and hence the weight of ZIF structure gets smaller, during this process, will the gas (CH4) carry the heavy metal like Pt and Au to fly away, in other words, the weight loss of heavy metals?
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Interested
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I'm working on taniers (Xanthosoma spp.) and have weight of tubers and corms for five months. I want to know which treatment I'd used (8) have the highest weight. The treatments have two chemical fungicides, a SAR estimulator (Acivenzolar), a Biological control compound (Bioplex(R)) and the control.
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We often use the ANCOVA with equal slopes, the t-test on change from pre-treatment measurement or the t-test on post-treatment measurement to compare treatment groups.
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Consider TGA curve of a mixed-ligand metal(II)complex of like 3 or 4 steps decomposition pattern?
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I am attaching 2 articles which will help you to calculate %weight loss of molecules from Thermogravimetric Analysis TGA curve.
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I prepared a nanocomposite system made from a polymer and inorganic filler and I need to determine from TGA the amount of each compound. The TGA provide the weight loss in % of the organic matter (polymer) and I want to know how to determine the mass of the grafted polymer from this percentage and the mass of the filler as well.
Thank you.
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First of all, you must be sure that:
1- All the organic matter has been removed due to the thermal treatment.
2- Any part of the inorganic is not removed due to the thermal treatment.
If these conditions are satisfied, you can calculate the:
- The mass of the polymer= total weight of your composite * weight loss % from TGA).
- The mass of the filler= total weight of the composite* (1-weight loss % from TGA).
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Hello everyone, I ran some TGA (coupled with DSC) tests on two barks of two different trees and an invasive grass, because I want to compare the thermal stability calculating the activation energy and other parameters like onset temperature. I used 5 different heating rates (5,10,20,30 and 40 °C/min). For the grass I get relatively coherent curves. Nevertheless for the trees and the 40°C/min heating rate I get a drastic mass loss in the first 2°C of heating. (I attach the image, there are 3 curves because I separated the inner and outer bark for one of the trees). The other heating rates work just fine.
Thank you in advance
Cheers
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Thank you everyone for your responses. I am not sure about the initial mass and the calibration, because for that same heating rate and other kind of sample (grass) it works just fine, so my equipment is working properly. I also have subtracted the zero curve (made on the same alumina crucible and the same heating rate). As Carlos pointed out, the curve works fine below -100% relative mass change, so I might just correct it with the inital weight and see if it works. What I think is peculiar is that it happened for all the bark samples, not just one.
Cheers
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