#1 yo-yo dieter!!!!

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I am probably best yo-yo dieter you will ever meet!! I want to put a stop to it starting tomorrow morning. The only thing is this time I don't want it to be a diet, I want this to be a new way of life for me! I want to lose about 50lbs! I'm going to need a lot of motivation and support along the way. :) tips and criticism welcomed!!! Btw I'm 5'6 196