By Height By Weight  

55 lbs Weight Gain 5 foot 9 Female 120 lbs to 175 lbs

Here we have a progress pic showing a muscle gain from 120 pounds to 175 pounds. That's a respectable gain of 55 pounds.

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55 lbs Weight Gain 5 foot 9 Female 120 lbs to 175 lbs
F/23/5’9” [120 lbs > 175 lbs = 55 lbs] been struggling in my anorexia recovery :( trying to appreciate my progress