Unfortunately, how babies are fed is not always entirely to blame. It is likely that some overweight people actually inherit a defective appestat, a sweet tooth or even a feature of having less food dislikes. These inherited traits predispose to childhood overeating. In turn, childhood overeating, whether it be due to environmental factors or inherited traits or both, may further damage the appestat. Children who overeat become fat.
Fat children tend to become fat adults.
Childhood is of course not the only time that overeating happens. There are many reasons why adults eat too much even if they ate quite normally as children. Some people eat too much because they have a psychological or psychiatric disorder . Many people who are emotionally disturbed or depressed overeat, probably because they find food comforting. Some people increase their food consumption when they are under stress rather as other people tend to bite their nails.