I gained around 10 pounds my first year on T, but I'm now actually sitting a bit lower than my pre-T weight while being much more trim and lean. I think it was a combination of muscle and fat, but once I got out of the "awkward" early stages and stepped up my exercise routine, things started to sort themselves out. I was also careful to maintain my eating habits and not start inhaling a bunch of junk just because my metabolism had picked up. I've always been an active person, but going on T inspired me to lift more, run longer distances, etc. Cardio is great for weight loss or even just maintaining your current size, so give running or biking a shot if you're worried about your weight creeping up too much.