Omar Alhaj

Omar Alhaj
Petra University · Department of Nutrition

BSc, MSc, PhD
Omar Alhaj is associate professor and head of Nutrition department at University of Petra.

About

65
Publications
11,472
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
683
Citations
Additional affiliations
March 2020 - June 2022
Petra University
Position
  • Professor (Associate)

Publications

Publications (65)
Preprint
Full-text available
Religious fasting is practiced by people of all faiths, including Christianity, Islam, Buddhism, Jainism, as well as Hinduism, Judaism, and Taoism. Individual/clinical, public, global, and planetary health has traditionally been studied as separate entities. Nevertheless, religious fasting, in conjunction with other religious health assets, can pro...
Article
Aims The primary goal of this meta-analysis was to examine the changes in various components of metabolic syndrome (MetS) in healthy adults who observed Ramadan fasting (RF) before Ramadan (T1) and at the end of RF (T2). A secondary goal was to assess the impact of RF on MetS severity in various ethnic and sex groups using the MetS z-score. Data s...
Article
Full-text available
Purpose: The purpose of this review was to estimate the prevalence of screen-based disordered eating (SBDE) and several potential risk factors in university undergraduate students around the world. Methods: An electronic search of nine data bases was conducted from the inception of the databases until 1st October 2021. Disordered eating was define...
Article
Full-text available
Purpose Medical students have a higher risk of developing psychological issues, such as feeding and eating disorders (FEDs). In the past few years, a major increase was observed in the number of studies on the topic. The goal of this review was to estimate the prevalence risk of FEDs and its associated risk factors in medical students. Methods Nin...
Article
Introduction NOMOPHOBIA is a term used to describe an anxiety disorder in which people fear being disconnected from their mobile phones. Strong associations between nomophobia and insomnia have previously been documented. However, there is no clear explanation for this relationship between the two disorders. The present study was designed to first...
Preprint
Camel milk and collagen-related issues
Article
Full-text available
This research was carried out to study the variation in ethanol stability and chemical composition of five camel milk samples, including two pasteurized samples (Alwatania and Darir alabaker) and three raw samples (Majaheim, Wadah, and Hamra). Ethanol stability was analyzed by dispersing camel milk samples with 0 to 100% ethanol (v/v). The findings...
Article
Camel milk consists an essential macro/micronutrient for human nutrition in the arid and urban regions. This review study aimed to use of meta-analysis statistical techniques for assessment and correction of publication bias, exploration of heterogeneity between studies, and detailed assessment of the effect of a comprehensive set of moderators inc...
Preprint
Simple Summary: Camel milk has recently gained the interest of consumers and the dairy industry, as it is widely suggested as an ideal substitute for cow milk. The nutritional value and the bioactivity of camel milk proteins have received particular attention from research groups and industrial companies around the world. Camel milk proteins can be...
Article
This systematic review and meta-analysis evaluated the extent of sleep disturbances during the COVID-19 pandemic. Eleven databases (Cochrane, CINAHL, EBSCOhost, EMBASE, Google Scholar, MEDLINE, ProQuest Medical, PsycINFO, ScienceDirect, Scopus, and Web of Science) and six preprint repositories were searched for the period From November 1, 2019, to...
Preprint
Eating before the night is advised in sleep hygiene recommendations, however, the effect of eating on sleep has proven inconsistent. This study looked at the relationship in 22 Arabic nations.
Article
Full-text available
Background: We aimed to examine the effect of the COVID-19 pandemic and associated mitigation measures on sleep quality and psychological distress in Saudi Arabia. Methods: Subjective sleep quality over the preceding 30 days was measured using the Pittsburgh Sleep Quality Index (PSQI). In addition, Kessler Psychological Distress Scale (K10) was us...
Article
Full-text available
1) Background: ESports is a new trend of sports, which has gained considerable popularity worldwide. There is a scarcity of evidence that focuses on the lifestyle of ESports players (eSP) particularly on symptoms of nomophobia, level of anxiety, sleep quality, food consumption and physical activity. (2) Objective: to determine the prevalence and re...
Article
Full-text available
Since COVID-19 was declared as a pandemic, a race between researchers has begun to deeply examine the mechanism of the virus and how to combat it. Few clinical investigations and studies have paid attention to the role of micronutrients in the disease's course and how it may affect the disease outcomes. Micronutrients have a noticeable effect on th...
Article
This systematic review and meta-analysis evaluated the extent of sleep disturbances during the COVID�19 pandemic. Eleven databases and six preprint repositories were searched for the period from November 1, 2019, to July 15, 2021. The DerSimonian and Laird method was used to develop random-effect meta�analyses. Two hundred and fifty studies compri...
Article
Full-text available
Background and objective: Sleeping difficulty affects the overall health, nutrition, and wellbeing. The Mediterranean diet has proven its effect on improving the quality of life and overall health out-comes among people of all ages. Therefore, this study aims to determine whether adherence to a Mediterranean diet (MD) predicts reduced insomnia in A...
Preprint
Purpose: Medical students have a higher risk of developing psychological issues, such as feeding and eating disorders (FEDs). In the past few years, a major increase was observed in the number of studies on the topic. The goal of this review was to estimate the prevalence risk of FEDs and its associated risk factors in medical students. Methods: Ni...
Article
Purpose This study aimed to translate and test the content validity and reliability of an English questionnaire used in the American food and health survey. Methods The questionnaire was developed using 6 stages, then examined for test–retest. A total of 672 participants were recruited for validation and reliability. Validity test was performed us...
Article
Full-text available
Purpose: NOMOPHOBIA (NO MObile PHone PhoBIA) or problematic smartphone use is a psychological disorder in which people are afraid of being cut off from their mobile phones. Currently, there has been no direct assessment of mobile phone screen size in the home setting and its effect on nomophobia and related symptoms, such as insomnia. Thus, we inv...
Article
Background: The prevalence of overweight and obesity is still on the rise worldwide. Uncontrolled craving for specific foods has been associated with overweight/ obesity, categorizing them as possible abuse-related disorders with food addiction (FA) as their possible main phenotype. The association between FA and the onset of overweight/ obesity is...
Article
Full-text available
Abstract Purpose: Few previous studies estimated the association between micronutrient status and sleep quality; no previous work was done in patients with depression compared with healthy controls. Methods: Using a case-control research design, 96 patients with depression were age- and sex-matched with 96 healthy controls. Dietary assessment was...
Article
Background: Overweight and obesity prevalence are still on the rise worldwide. Uncontrolled craving for specific foods has been associated with overweight/ obesity, categorizing them as possible abuse-related disorders with food addiction (FA) as their possible main phenotype. The association between FA and the onset of overweight/ obesity are stil...
Article
Full-text available
Purpose: The COVID-19 outbreak has caused governments to put pandemic-related guidelines requiring compliance and understanding by healthcare professionals to mitigate its spread uncontrollably. We studied pharmacists' knowledge, attitude, and practice towards the COVD-19 outbreak compared with other healthcare workers during the pandemic in Saudi...
Article
Introduction: This study aimed to evaluate the knowledge, attitudes, and behavior (KAB) of the Jordanian society toward nutrition and diet during the COVID-19 era. Design and methods: This study is an observational, cross-sectional study using a structured, validated, reproducible, self-administered online Arabic questionnaire. KAB of the study par...
Chapter
This study aims to shape an insight towards researchers' involvement in research projects in the Arabian region, mainly through assessing the intrinsic and extrinsic motivations towards research and their association with research attitudes and preferences. A cross-sectional study was conducted in the Arab states amid the COVID19 pandemic. A questi...
Article
The present study aimed to investigate the antihypertensive effect of camel milk hydrolysate in rats with fructose-induced hypertension. The antihypertensive effect of fermented camel milk was determined using six groups comprising thirty-six Wistar male rats. It altered the blood pressure of rats via exposure to a 10% fructose (w/v) diet in drinki...
Preprint
This is the first valid survey to be used for Arabic-language speakers as a tool to initiate an assessment of community resources and needs at different periods of time and, most likely, after certain interventions. Jordanian nutrition and diet behavior can be invested to improve the dietary interventions designed by nutrition and dietetics profess...
Preprint
Purpose This paper aims to translate and validate an Arabic version of the Barriers to Access to Care Evaluation (BACE) BACE scale to make it appropriate for the targeted socio-cultural and linguistic context. Design/methodology/approach This psychometric study has two main compounds: translating the BACE into Arabic and validating it. Using the b...
Article
Aim This study was aimed to assess the knowledge and the perception regarding ketogenic diet (KD) followers among Arab adults. Methods Self-administered, cross-sectional survey was conducted among seventeen Arab countries. The data of nutritional knowledge perception was evaluated using valid questionnaire to evaluate the frequencies and the perce...
Method
This survey examines the Knowledge, attitudes, and behavior toward diet and nutrition during the SARS-CoV-2 pandemic. This survey is valid, reproducible, self-administered online as Arabic questionnaire with a reliability test (Cronbach alpha) of 0.9 for all questions
Method
Full-text available
Survey questions examine Knowledge, attitudes, and behavior toward diet and nutrition during the SARS-CoV-2 pandemic. Questions Validated, reproducible, self-administered online Arabic questionnaire with a reliability test (Cronbach alpha) of 0.9 for all questions.
Article
The complex interaction between the gut flora and central nervous systems made probiotics one promising natural candidate for the management and treatment of depression. Hence, the purpose of this paper was to assess the knowledge, patterns of consumption, and attitudes of patients with depression towards probiotics. In this cross-sectional study,...
Article
Background Consumption of energy drinks (EDs) has increased exponentially among younger generations and this increase is projected to continue. Objectives This study aimed to examine the prevalence, knowledge level, intake patterns, and consumer experience of consuming EDs among university students in Jordan. Methods A cross-sectional study of 46...
Article
Full-text available
No previous research has examined the association between symptoms of nomophobia and food addiction. Similarly, only a few studies have examined the association between nomophobia and symptoms of insomnia. This exploratory study utilized an online self-administered, structured questionnaire that included: basic sociodemographic and anthropometrics;...
Preprint
Background: Wearables market is in a rapid growth and the usage lifestyle-tracking features like (step counting and sleep monitoring) became very customary among people. This study aims to increase the knowledge about the adult Bahraini population’s attitude towards wearable technologies and to assess the sleep quality and body mass in wearable use...
Article
Background: Tryptophan is an essential amino acid that is converted to serotonin in the central nervous system (CNS), with vitamin B6 as a cofactor. Serotonin levels are inversely related to the occurrence of depression. We hypothesized that cases with depression have less tryptophan and vitamin B6 intake compared to healthy controls. Subjects & Me...
Preprint
Tryptophan is an essential amino acid that is converted to serotonin in the central nervous system (CNS), with vitamin B6 as a cofactor. Serotonin levels are inversely related to the occurrence of depression. We hypothesized that cases with depression have less tryptophan and vitamin B6 intake compared to healthy controls.
Chapter
This chapter highlights the potential health benefits of camel milk including antioxidant, anti-cancer activity, antihypertensive properties, antidiabetic activity, antimicrobial activity, hypoallergenicity activity , and anti-Crohn's disease. In addition to the most recent identified functional properties of camel milk. The bioactivity of conjugat...
Book
Full-text available
In recent years, there has been a rise in the demand of alternative agricultural commodities, specifically camel milk-based products. Camel products have become highly coveted items in today’s commercial market due to their environmental and health advantages. However, there is a lack of research and literature on camel milk and related camel goods...
Article
Full-text available
The unique composition of camel milk limited its use for fermented products preparation. In this research, camel milk (CAM) or cow milk (COM) was blended with sweet potato starch (SPS). Blends were precooked and the rheological properties of the gel were determined. Since the elastic modulus ( G ′) was much greater than the viscous modulus ( G ″),...
Article
Full-text available
The effects of fermented skim milk versus unfermented skim milk of camel on the levels of cholesterol in blood were investigated in rats. Levels of serum cholesterol and LDL-C/ HDL-C ratio were decreased significantly in Wistar rats that fed with a cholesterol-enriched diet and administered fermented skim camel milk compared with rats administered...
Article
Full-text available
Background and Objective: Camel milk is a folk remedy that includes valuable nutrients and bioactive zoochemicals. However, the chemopreventive potential of camel milk against colon carcinogenesis is poorly understood. This study was conducted to investigate the chemopreventive potential of camel (Camelus dromedarius) and bovine milk as well as the...
Chapter
This chapter focuses on the potential health benefits of camel milk including angiotension I-converting enzyme-inhibitory, anti-cancer and antioxidant activities, antidiabetic, antimicrobial and hypoallergenicity effects. The bioactivity of oligosaccharide, conjugated linoleic acid and D-amino acid in camel milk is provided. The proposed mechanisms...
Patent
Full-text available
The method of making a fermented dairy product from camel milk includes heating camel milk at 85°C for thirty minutes, cooling the milk to about 60°C and adding a stabilizer or hydrocolloid (preferably 0.02% by weight κ-carrageenan) to avoid whey off (whey separation) problems, then cooling the milk and adding a probiotic bacterial culture. The cam...
Article
Full-text available
Background: Hypertension is one of the most common diseases in worldwide, thus prevention of hypertension is important in reducing the risks of cardiovascular disease. Milk contains bioactive peptides released during milk fermentation which lead to exhibit angiotensin I converting enzyme (ACE) inhibitory. Objective: The aim of this study was to inv...
Chapter
Full-text available
This chapter focuses on the potential health benefits of camel milk including angiotension I-converting enzyme-inhibitory, anti-cancer and antioxidant activities, antidiabetic, antimicrobial and hypoallergenicity effects. The bioactivity of oligosaccharide, conjugated linoleic acid and D-amino acid in camel milk is provided. The proposed mechanisms...
Article
This study aimed to determine the angiotensin converting enzyme-inhibitory activity and antimicrobial effect of fermented camel milk. Samples were prepared either using Lactobacillus acidophilus and Streptococcus thermophilus or Lactobacillus helveticus and Str. thermophilus and labelled as S1 and S2, respectively. The IC50 values of S1 and S2 samp...
Article
Full-text available
Camel milk is a good nutritional source for people living in the arid and urban areas. This study aim to identify ACE-inhibitory peptides from dromedary camel milk produced using Lactobacillus helveticus or Lactobacillus acidophilus. Ten ACE-inhibitory peptides were identified using HPLC-MALDI-TOF MS. L. helveticus strain was found superior in resp...
Article
Full-text available
Nowadays, the need for new dietary containing some bioactive peptides with specific amino acid sequences increased to express biological functions. We investigated the hypocholesterolemic effect and ACE-inhibiting activity of bovine casein hydrolysates with different molecular weights. The bovine casein was hydrolysed with trypsin for different amo...
Article
Full-text available
Article
Alicyclobacillus is a causative agent of spoilage in pasteurized and heat-treated apple juice products. Differentiating between this genus and the closely related Bacillus is crucially important. In this study, Fourier transform infrared spectroscopy (FT-IR) was used to identify and discriminate between 4 Alicyclobacillus strains and 4 Bacillus iso...
Article
Full-text available
Antioxidant activity of camel and cow milk hydrolysed casein was studied. Camel and cow milk casein were hydrolysed using trypsin enzyme for 0 to 180 min. Total phenol compounds, reducing power, 1, 1-Diphenyl-2-picryl-hydrazyl (DPPH) scavenging activity and lipid hydroperoxide were determined as indicators for antioxidative potential of hydrolysed...
Article
Whereas an abundance of literature is available on the occurrence of common proteinogenic amino acids (AAs) in edible fruits of the date palm (Phoenix dactylifera L.), recent reports on non-proteinogenic (non-coded) AAs and amino components are scarce. With emphasis on these components we have analyzed total hydrolysates of twelve cultivars of date...
Chapter
Milk and dairy products have received much interest in research, industrial applications and commercially as a commodity. They have been used for their functional properties, nutritional value and recently as a functional food for their physiological impact in promoting human health, especially for their bioactive components. These bioactive compou...
Article
Full-text available
Heat coagulation time-pH curve (HCT/pH) of camel milk in the range of pH 6.4-7.2 was determined at 120 °C. The effect of dialysis of camel milk against Jennes and Koops buffer on HCT was determined. Moreover, the addition of camel milk whey and casein addition as well as urea, formaldehyde and mixture of both was studied. Results showed that camel...
Article
It has been suggested that bactrian camel milk and colostrum may be a good source of biologically significant oligosaccharides but, although the oligosaccharides found in bactrian camel milk and colostrum have been characterised, those in dromedary camel milk have not. In this study, seven oligosaccharides from commercially available pasteurised dr...
Data
Hypercholesterolaemia is one of the most important risk factors in the development of cardiovascular disease. In this study, we report the in vitro potential of Bifidobacterium animalis subsp. lactis (Bb12) cultures and bovine casein hydrolysates formed by trypsin and Bb12 culture to reduce cholesterols levels. Cholesterol levels in vitro were redu...
Article
Full-text available
In this study, the problem associated with stability of camel milk proteins after sterilisation process were studied and discussed. Camel milk has poor heat stability at high temperature and could not be sterilised at natural pH. Various attempts were adopted to overcome this problem including the addition of ĸ-casein and different additives includ...
Article
A comprehensive review on Dromedary camel milk composition in comparison with bovine milk, the factors effecting camel milk composition, and an overview of production, properties, nutrition value, dairy products and functionality is provided. The mean values of camel milk composition reported from 1980 to 2009 are as follows: protein 3.1%; fat 3.5%...
Article
Purpose – The main aim of this study is to investigate the whey protein profiles of different commercially available fermented milk drinks that might have been influenced by the growth of probiotics bacteria that have been added according to the claims made by the manufacturer. Design/methodology/approach – The growth and the subsequent effect of...

Network

Cited By

Projects

Projects (28)
Project
Recent research showed that in non-fasting group pre-Ramadan depression and anxiety symptoms were present in 34%, and 50% of people, which improved to 30% and 40% post Ramadan (p-value 0.625, 0.227) respectively, while no improvement was observed in stress symptoms. Findings also showed that The data revealed that total PA (p < 0.001, p < 0.05, respectively) vigorous metabolic equivalent of task (MET) (p < 0.001, p < 0.05, respectively), moderate MET (p < 0.001, p < 0.01, respectively) were higher before COVID-19 and before Ramadan than during Ramadan. Regarding burnout subscales, emotional exhaustion (p < 0.001, p < 0.01, respectively) was higher before Ramadan than before COVID-19 and during Ramadan. A lower personal accomplishment was reported before Ramadan than before COVID-19 and during Ramadan (both p < 0.05). In addition, low to high correlations were observed between PA intensities and burnout subscales, except for the correlation between depersonalization and all PA intensities. In conclusion, Ramadan intermittent fasting along with PA was highly recommended for teachers and the general population to improve positive emotions and general health.
Project
Diet-Induced Low-Grade Metabolic Acidosis Or Alkalosis and Clinical Outcomes: A Systematic Review and meta-analysis
Project
Estimate the Prevalence of Screening High School Students for Eating Disorders: Results of a Systematic Review and Meta-analysis