The results of this study were that age, height, weight, and body mass index of participants with PWS were not significantly different from those without it. While fat mass values were also not significantly different, fat free mass was substantially lower in the group with PWS. Lower fat free mass is associated with adiposity. Total body water was also significantly lower in the group with PWS. The extra cellular/intracellular water measurements were higher in the group with PWS. Fat mass was found to be inversely related to physical activity. It was found that a positive effect of physical activity was initiated on body composition; however, it was uncertain whether decreased physical activity causes an increase in fat mass or if high fat mass reduces the ability to do physical activities.