Another way exercise helps is that it curbs hunger.When you exercise,fat is released into your blood-stream and your blood-sugar level does't drop.And low blood sugar is the single most important stimulus to make you hungry.So when people exercise,they are likely to eat less Q.Isn't diet important in losing weight? A.Of course.But if you don't exercise,25 to 50 percent of the weight you lose will be muscle.So if you ever get back up to your previous weight,you will really be fatter than before you started dieting.Even if you lose weight by dieting alone.studies show you are not likely to keep the weight offAnother way exercise helps is that it curbs hunger. When you exercise, fat is released into your blood-stream and your blood-sugar level does’t drop. And low blood sugar is the single most important stimulus to make you hungry. So when people exercise, they are likely to eat less. Q. Isn’t diet important in losing weight? A. Of course. But if you don’t exercise, 25 to 50 percent of the weight you lose will be muscle. So if you ever get back up to your previous weight ,you will really be fatter than before you started dieting. Even if you lose weight by dieting alone, studies show you are not likely to keep the weight off