There are so many pages of posts about weight gain that my question has probably been addressed, but it would take a very long time to go through them. I was diagnosed with Graves about six months ago and had RAI a little over two months ago. I had lost about 20 pounds over the course of several years before the diagnosis, and while I hadn't been overweight before that, just carrying a few more pounds than I would have liked, I was fine with losing weight until it reached a point where I felt it was getting dangerous and beyond my control. Well, I'm beginning to gain some back, maybe just 5-7 pounds at this point. I'm not taking medication because my thyroid levels were normal the first time I had lab tests after treatment. I'm due for another round of tests soon. I'm neither a couch potato nor an athlete, but I have increased my exercise routine—long, vigorous walks—lately, going out even in the typical summer heat and humidity of the area where I live, when previously I would have shrugged it off. I've also been even more conscientious about menu planning, but I can feel the weight piling on, my clothes getting tighter, no matter what I do. Today it felt like I could barely fasten a belt I often wear after months of moving it notch after notch tighter. I've been doing research on exercise bikes and am about to decide on the one I want, hoping the more vigorous biking as a supplement to the walking will help. Is this futile (certainly the exercise is good for me in terms of overall health)? Is there nothing I can do to control this, just as I couldn't control the loss? I've always been relatively slender, or at least “normal,” and the thought of turning into a “blimp” is extremely discouraging, especially when it isn't due to bad habits.