Effects of weight loss on insulin sensitivity and arterial stiffness in overweight adults
School of Kinesiology, University of Minnesota, Minneapolis, MN 55455, USA. Metabolism
(Impact Factor: 3.89).
07/2006; 55(7):907-11. DOI: 10.1016/j.metabol.2006.02.018
Obesity is characterized by metabolic and vascular abnormalities. We examined the effects of weight loss on insulin sensitivity and arterial stiffness in overweight adults. Twelve (9 females; 3 males) overweight (body mass index, 30.3 +/- 3.7) adults (54.9 +/- 3.9 years) without diabetes or vascular disease were counseled by a registered dietician to lose weight over 6 months. Vascular structure, function, and wall mechanical properties were measured via ultrasound. Intravenous glucose tolerance test, 24-hour blood pressure, body composition (dual-energy x-ray absorptiometry), and lipids were also assessed. There were significant reductions in body mass (86.3 +/- 14.2 vs 79.5 +/- 13.8 kg, P < .0001) and percentage of fat (44.3% +/- 7.0% vs 41.0% +/- 8.5%, P < .01) after weight loss. There were significant improvements in total cholesterol (6.0 +/- 0.9 vs 5.0 +/- 0.8 mmol/L, P < .0001), low-density lipoprotein cholesterol (3.9 +/- 0.7 vs 3.2 +/- 0.6 mmol/L, P < .0001), triglycerides (3.4 +/- 2.3 vs 2.4 +/- 0.9 mmol/L, P < .05), and insulin sensitivity (3.3 +/- 1.7 vs 5.4 +/- 1.6 microU x 10(-4) min(-1) mL(-1), P < .0001) after weight loss. Brachial artery compliance (P < .05) and distensibility (P < .05) curves over the physiologic pressure range improved, whereas endothelial function and intima-media thickness remained unchanged. In overweight adults, 6 months of weight loss resulted in improvements in body composition, insulin sensitivity, lipid profile, and brachial artery compliance and distensibility.
Available from: Lauren Ball
- "Controlling the modifiable risk factors for T2D, including obesity, hyperglycaemia, hypertension and dyslipidaemia, can reduce the incidence of cardiovascular and other complications (Shamoon et al. 1993). Lifestyle intervention studies have demonstrated that intensive nutrition and physical activity advice improves many modifiable risk factors for complications of T2D (Dengel et al. 2006; Pi- Sunyer et al. 2007; Wing 2010). Specifically, nutrition advice provided by dietitians in multiple consultations has been shown to result in improved weight and glycaemic control in individuals with T2D (UKPDS Group 1990; Franz et al. 1995; Ash et al. 2003). "
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ABSTRACT: The aim of the present study was to investigate the participation and weight and waist circumference outcomes of patients with type 2 diabetes (T2D) receiving Medicare-subsidised dietetic services. A prospective observational study was conducted between January and September 2011 involving three private practice dietitians who provided services at 11 medical centres in south-east Queensland. All patients with T2D who were referred by their general practitioner (GP) to one of the dietitians as part of their team care arrangements were asked to participate. Participants' attendance at consultations was recorded for the study duration. The dietitian collected weight and waist circumference measures at each consultation. In all, 129 participants (mean age 58.9 +/- 15.7 years; mean body mass index 32.2 +/- 5.6 kgm(-2)) were included in the study. The most frequent number of consultations allocated to a dietitian was two. Small, but significant reductions in bodyweight (1.9 +/- 2.9 kg; P <= 0.05) and waist circumference (2.0 +/- 4.8 cm; P < 0.05) were observed from the initial to final consultation. Participants who attended more than two consultations lost significantly more weight than those who attended two consultations only (3.7 +/- 4.2 vs 1.1 +/- 1.6 kg, respectively; P <= 0.05). Almost one-third of participants (n = 38; 29%) did not complete the allocated number of consultations available through their referral. Modest weight and waist circumference reductions are achievable for patients with T2D receiving Medicare-subsidised dietetic services. The clinical significance of these reductions requires further investigation. Patients who attend more consultations with a dietitian may experience further improvements in weight and waist circumference outcomes. However, many patients do not complete the number of consultations allocated. Further research is required to explore the determinants of attendance at consultations in order to maximise potential improvements in health outcomes for patients receiving Medicare-subsidised dietetic services.
Available from: Daiji Nagayama
- "Furthermore, visceral adiposity is also known to cause other atherogenic factors such as elevated blood pressure and dyslipidemia . Body weight reduction is therefore considered to prevent progression of atherosclerotic diseases especially in patients with visceral adiposity  . "
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Obesity is associated with type 2 diabetes, dyslipidemia and hypertension, contributing to atherogenesis. Weight reduction is the fundamental therapy for obesity. Recently, a novel arterial stiffness parameter called cardio-ankle vascular index (CAVI) has been developed. We hypothesized that CAVI may be a candidate marker of increased vascular stiffness in obese patients. The aim of this study is to investigate the effect of weight reduction on CAVI.
Subjects and methods:
Using CAVI as an indicator, we assessed the changes in arterial stiffness in 47 obese Japanese subjects (aged 46 ± 13 years) who underwent a 12-week weight reduction program consisting of a calorie restriction diet (20-25 kcal/day) and exercise therapy. Visceral fat area (VFA) was evaluated by CT.
At baseline, CAVI correlated positively with age (r = 0.70), blood pressure (r = 0.23), VFA (r = 0.26) and HbA1c (r = 0.39). After 12 weeks of weight reduction, mean BMI decreased from 33.3 ± 7.5 to 30.7 ± 6.4 kg/m(2) (p < 0.0001), and mean CAVI decreased from 8.3 to 7.9 (p < 0.01). The change in VFA correlated positively with change in CAVI in subjects with decrease in CAVI (r = 0.47). Furthermore, change in VFA was a significant independent predictor for change in CAVI. No significant correlation was observed between change in CAVI and clinical variables such as BMI, HbA1c and lipids.
This study demonstrated that CAVI decreased after weight reduction, and was associated with a decrease in VFA. CAVI reduction maybe a marker of improved vascular stiffness after weight reduction in subjects with visceral adiposity.
Available from: Eric Doucet
- "The increase in SQ also observed after weight loss means a greater satiating effect of the test meal after weight loss, suggesting that the system is more sensitive to food-induced satiety signals. Since weight loss also increases insulin sensitivity (Dengel et al., 2006), we could expect that changes in insulin sensitivity would be related with changes in SQ. However, we did not find a relationship between changes in fasting insulin levels and changes in SQ in this study (data not shown). "
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ABSTRACT: The aim of this study was to further evaluate the validity and clinical meaningfulness of appetite sensations to predict overall energy intake as well as body weight loss.
Men (n = 176) and women (n = 139) involved in six weight loss studies were selected to participate in this study. Visual analogue scales were used to measure appetite sensations before and after a fixed test meal. Fasting appetite sensations, 1 h post-prandial area under the curve (AUC) and the satiety quotient (SQ) were used as predictors of energy intake and body weight loss. Two separate measures of energy intake were used: a buffet style ad libitum test lunch and a three-day self-report dietary record.
One-hour post-prandial AUC for all appetite sensations represented the strongest predictors of ad libitum test lunch energy intake (p < or = 0.001). These associations were more consistent and pronounced for women than men. Only SQ for fullness was associated with ad libitum test lunch energy intake in women. Similar but weaker relationships were found between appetite sensations and the 3-day self-reported energy intake. Weight loss was associated with changes in appetite sensations (p < or = 0.01) and the best predictors of body weight loss were fasting desire to eat; hunger; and PFC (p < or = 0.01).
These results demonstrate that appetite sensations are relatively useful predictors of spontaneous energy intake, free-living total energy intake and body weight loss. They also confirm that SQ for fullness predicts energy intake, at least in women.
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