This short piece about hypothyroidism and weight gain gives me a little hope that I might be able to resolve my issues. I've gained nearly 10 lbs in 6 mos. I'm still not overweight but it is frustrating because I eat well and am extremely active --I cycle over 200 miles a month, plus weight training and walking. My metabolism is about zero and my abdomen is swollen like a bowling ball. Before this I maintained a good weight at 145 for a long time. I'm 57. What may have triggered this? (I have an appointment w an endocrinologist scheduled).