Why am I gaining weight?????????

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Hey, I have been dieting for a while, it used to be so easy to lose weight, water fast one day and, bam! Down by three. But now I can’t lose weight no matter what....
I know this isn’t healthy but sometimes I try not to eat for a few days at a time! But my weight is so stubborn and I feel desperate...does this happen to anyone els? I can’t concentrate in school anymore so I got this app to reach my goals but if I eat the recommended amount I’ll gain a ton!!!!!!
Any advice?

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