I was in the gym five days a week, two hours a day...

I was in the gym five days a week, two hours a day. At one point, I was going seven days straight. I had put on a lot of weight, and then I started losing it drastically, so I was worried. It turned out I was overworking myself. My trainer told me that I couldn't break a sweat, because I was burning more calories than I was putting on.