I would like to look at a recent survey conducted by Canadian researchers on diet. Total thirty-one women volunteered in the survey. They've been told to participate in the exercise program without changing their diet. After careful observation, the researchers actually found that some volunteers experienced a body fat change after six months from the day they've started the experiment. The finding further stated that some actually lost a significant amount of fat, which led to a decrease in body mass. On the other hand, there were others who did not lose fat at all. So, I guess, the study concludes that there must be two explanations. Those who did not lose weight must have eaten more. And another factor is that it is because there are psychological reasons—not to believe in losing fat.