In order to satisfy hunger in the long run you want to fill up the fat cells. So, if you diet to lose weight, you reduce the fat in the fat cells. The fat cell hypothesis then predicts that diets will fail in the long run because of this. Probably genetically determined. Stomach distention plays some role in regulating eating.
Some people are more sensitive to bodily cues than others.
Finally, the fasting study looking at people fasting during Yom Kipper. The idea is that many people are strongly inclined to look thin in this culture and spend lots of effort and time trying to control their food intake in various ways. Drive reduction theory. The behaviorist view of learning as a modification in behavior based on experience. Not all behavior or learning fits these basic models, but they are nonetheless of great use.