International journal of obesity : journal of the International Association for the Study of Obesity
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Randomized Controlled Trial
Enhanced food intake regulatory responses after a glucose drink in hyperinsulinemic men.
To determine the effect of hyperinsulinemia on food intake and plasma concentrations of glucose and food intake regulatory hormones in men after a glucose drink. ⋯ These results support epidemiological data suggesting that hyperinsulinemia, at least in the early stages, may provide resistance to weight gain, possibly through physiological mechanisms of food intake control.
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Comparative Study
BMI, fat and muscle differences in urban women of five ethnicities from two countries.
To investigate body composition differences, especially the relationship between body mass index (BMI) and percent body fat (%BF), among five ethnic groups. ⋯ The relationship between %BF and BMI varies with ethnicity and may be due, in part, to differences in central fatness and muscularity. Use of universal BMI or waist cut-points may not be appropriate for comparison of obesity prevalence among differing ethnic groups, as they do not provide a consistent reflection of adiposity and fat distribution across ethnic groups.
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One of the main causes of obesity is overconsumption of diets high in fat and sugar. We studied the metabolic changes and food-motivated behavior when rats were subjected to a choice diet with chow, lard and a 30% sucrose solution (high fat high sugar (HFHS)-choice diet). Because rats showed considerable variations in the feeding response to HFHS-choice diet and in food-motivated behavior, we investigated whether the motivation to obtain a sucrose reward correlated with the development of obesity when rats were subsequently subjected to HFHS-choice diet. ⋯ Our data suggest that the motivation to respond for palatable food correlates with obesity due to an obesogenic environment. Conversely, the HFHS-choice diet, which results in obesity, also increased the motivation to work for sucrose. Thus, being motivated to work for sucrose results in obesity, which, in turn, increases food-motivated behavior, resulting in a vicious circle of food motivation and obesity.