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1. Large numbers of fat cells deliver signals that tend to stimulate overeating. It is believed that overeating behaviors start early in life and set the stage for adult obesity by increasing the number of fat cells during childhood. During the rest of the life more fat will be stored in these existing cells and obesity develops. Thus the more cells there are, the more fat can be stored. Researchers have also found that the fat cells themselves may stimulate overeating. This idea can explain the yo-yo effect seen in dieting people. When they lose weight, the metabolic rate of the body falls sharply. The body burns less calories which are taken in. When they gain weight, the metabolic rate increases like a furnace being stoked, resulting in increasing appetite. Each successive weight loss occurs more slowly while regaining lost weight occurs three times as fast.

2. Obese people are more fuel efficient and more effective fat storers. Although it is often assumed that obese people eat more than other people this is not necessarily true, many actually eat less than other people.

3. Obesity is the destiny of those inheriting two obesity genes. However a true genetic predisposition for "fatness" appears to account for only 5% of the U.S. obese.