Journal of School of Public Health and

Background and Aim: Obesity is now recognized as the most prevalent metabolic disease worldwide.A decrease in resting energy expenditure (REE) may increase risk of obesity. This study was carried out to compare dietary, biochemical, anthropometric and body composition parameters and physical activity in obese women with a normal and those with a low REE.

Materials and Methods: A total of 49 subjects (women, 30-50 years old), were divided into three groups: group one (obese, n = 16) with a body mass index (BMI) of 28-39.9 and a normal REE, group 2 (obese, n = 17) with a BMI of 28-39.9 and a low REE, and group 3 (n = 16) with a normal BMI and a normal REE as the control group. Anthropometric measurements, body composition, REE and fasting blood lipid profile were determined in the 3 groups. In addition, dietary intakes and physical activity were assessed using valid questionnaires.

Results: There was no significant difference in body composition between the two obese groups. However, REE was significantly lower in the obese group with a lowREE than in the other 2 groups.Energy and macronutrient intakes and physical activity were not statistically different among the 3 groups. Neither was there any significant difference between the 2 obese groups (one with a normal and one with a low REE) as regards lipid profile.

Conclusion: The results of this study indicate that in some obese people the resting energy expenditure is much lower as compared to that in other obese people, although their body composition, age, sex, dietary intake, lipid profile and physical activity are not different.