I partially agree with the family theory. I am the oldest of 7 children and as a result, I did a lot of the more grown up chores for my mother. In reward, the best snacks were put aside for me and I was allowed to wait until all the other kids were asleep to eat my treat.
To this day, I am really good at saving a treat until a special, quiet time when I can get the utmost enjoyment. But, I don't overeat. I can walk past the same box of cookies for a week. When I decide to have one, I choose the time and place and savor it. I'm pretty weird.
I nearly always clear my plate, though.. that's a left over from punishment as a kid for not eating everything. I may not put a lot on my plate, but whatever is on it, I eat it all. I also eat in circles... a little of each food on the plate in equal portions. I'm pretty weird.
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"I never made "Who's Who"- but sure as hell I made "What's That??..."