Diet, Body Fat Distribution, and Serum Leptin in Young Men with Undiagnosed Obstructive Sleep Apnea Syndrome

Background and Purpose: Little is known about influences of obstructive sleep apnea syndrome (OSAS) on dietary intake and body composition. The purpose of this study was to evaluate dietary status, body fat distribution and leptin in overweight young men with and without OSAS in comparison to published values for normal weight counterparts. Methods: Groups were comprised of 24 sedentary overweight young men with and without OSAS, who had a body mass index (BMI) greater than 25 kg/m. Serum leptin concentration was measured in the 24 subjects using radioimmunoassay, while OSAS assessment was done using nighttime home somnography. Analysis of 4-day diet recalls was performed using Nutritionist Pro (First DataBank, Inc., San Bruno, CA). A Healthy Eating Index (HEI) score was calculated for the 24 overweight subjects. Results: There were no differences between the two overweight groups for total fat mass, central abdominal fat, BMI, waist circumference, leptin, or the HEI. The HEI was not predictive of overall OSAS severity; however, BMI was moderately related to OSAS severity (r = 0.39; p=0.05). The normal weight group did have a 50% higher report of carbohydrate intake, and consumed on average, 500 more kilocalories per day. The normal weight group consumed 50% less sodium, and 50% more Vitamin’s C and E including a 13% increase in the HEI. Conclusions: Regulation of eating behavior and related influences on diet composition may be affected by a number of neurohormonal disturbances associated with OSAS and/or obesity, itself. Further research is needed to quantify these possible differences on dietary status and the underlying mechanism involved.