Their lives are just so great! They can eat what ever they want when ever they want, don't have to worry about exercise, can be as lazy as possible, don't have to worry about dieting, and they can eat anything they want and not feel guilty about it.
-blam!- you fat people and your wonderful lives!
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But you end up with diabetes, have strokes, and who knows what other kinds of health problems. Great things to envy over.