[tsimionescu]

Ok, how does that explain why some people want to eat even when they're full, while others feel full after eating a grape (exaggerating)?

[908B64B197]

It doesn't.

Weight is a direct results of the calorie equation.

Appetite is regulated by a bunch of different factors. Actually, when you think about it, someone could live just fine being constantly hungry (so completely broken appetite signals) in a food scarce environment.