How come weight loss programs and dieting programs don't work?

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Question by behappi☺: How come weight loss programs and dieting programs don't work?
I'm currently doing an assignment for health class and the question is, well, the title of this question -- "How come weight loss programs and dieting programs don't work?" I mean things like Weight Watches, Jenney Craig, etc.
I've tried Google but nothing so far.
Thanks in advance!
Lol, Barbra,

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