your user name makes me laugh -Sisyphus was the character in greek mythology that pushed a boulder up a hill only to have it roll back down and he'd have to start over again.
I'd equate that scenario to fasting...

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Motivation is not something you find or lose, have or don't have. It is the product of how you see yourself in the world: active or passive, effective or ineffective, powerful or victimized, normal or pathological.