I'm struggling....

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I am so frustrated, I have been struggling with the same 5lbs for months now, I lose them and then I gain them back and so on.... I have now gained even more, I am 4lbs more this week than last week WTH!!!! I have actually recently really stepped up my game with alot more exercising so why would I gain???? I lost 54lbs on this site almost 2yrs ago and have been maintaining since then so why am I gaining all of a sudden??