My doctor said I gained a "significant" amount of weight. I gained 8 pounds in 4 weeks. I decided that maybe I should stop eating sugar? I am generally small, I'm 5'3 and started out at 115-120 I am 143 now. I'm 17 years old, will cutting out soda help with the weight gain? Should I lose weight? I don't eat much so the weight gain came as a shock, I do have a thyroid disorder it's hashimotos and I figured that could factor in. Has anyone else had this rapid weight gain? What did your doctor tell you?