I think it'd be good for some people, like UT mentioned - being overweight is a cycle for some folks. You feel bad about being fat, so you overeat. Your body feels clumsy and awkward and you worry about how you look in gym attire, so you don't exercise. If you suddenly looked and felt perfect, you might be motivated to get out there and jog, swim, climb mountains, have lots of athletic sexual encounters, etc.
But for those of us who are overweight just because we flat-out hate exercising and like to munch on junk food and drink beer, obviously its value would be questionable.
Now, if I could pay $100 or so to "reset" myself once a year, I might be content with that.
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