The answer is hunger. Psychological hunger is produced
by a wish to eat either out of custom, because you see good food everywhere
you, because you are expressive or upset, or since it tastes good. We contend
that obesity is not produced by physiological hunger, the virtuously
physical consumption of high-calorie meals at fast food eateries, or eating disproportionately
when you are full. As an alternative, hunger has psychological reasons,
and we frequently feel hungry even with full stomachs.
