An Interesting idea, but I don't think this is the reason. Food you prepare at home tends to have less fat/sugar than food you buy already prepared (especially

An Interesting idea, but I don't think this is the reason. Food you prepare at home tends to have less fat/sugar than food you buy already prepared (especially when you're using raw ingredients) Also, when I make a food for myself, laziness plays a role. Cooking a second serving takes more effort. I do not have industrial size cooking ware, so there is a physical limitation to how much food I can cook at once. I am not inclined to go through the whole process a second time, even when I might have eaten more if it was offered to me.