The purpose of this research is to investigate the changes in body weight, body fat ratio, body weight index, and waist-to-hip ratio after a diet program implemented with an exercise program. nalyzing changes in body composition, subjects were stratified according to their age, sex and their obesity level and differences between different groups were recorded.In this survey, which is conducted in line with the cross-sectional approach from screening models, measurements obtained from 543 subjects (411 women aged between 10-73 and 113 men aged between 11-77) were evaluated. t-test (Intepented sample t test) analysis and NOV analysis were performed on the analysis of measurements obtained from women and men. The acceptance of the changes in measurements were set to a significance level taken as p<0.05. Consequently, after the practiced exercise and diet program, it has been determined that the reduction in body fat ratio in men is superior to that in women (men %16,836±9,014, women %13,267±8,097).In women, changes in all body composition values except changes in waist-to-hip ratio were significantly varied, in comparison, in men, no significant changes in body composition values were obtained. When women were stratified according to their obesity level, body composition values were significantly changed except the changes in body fat ratio. This situation is totally inverse when men were investigated due to their obesity level. When men were stratified according to their obesity level, only the body fat ratio has been changed significantly with a regular exercise and diet program.