I didn't change my eating habits either, and when I was 18 I just gained 10 lbs out of the blue. My totally unscientific theory is that sometimes your body just decides that you need to gain or lose some weight.
I would definitely go see a doctor. Thyroid stuff can cause weight changes as can some other things. Your doc can also tell you what a healthy weight range for you might be. I know now that 5'2" and 99 lbs was not the right weight for my build once I reached 18, and that I'm stronger and healthier at 115-120 lbs. I just wish I didn't waste so much time at ages 18-22 stressing over it and eating unhealthily because of my obsession with staying the same weight as I was at age 12.
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Re: Why Did I gain this weight (and what can I do??)
