Our expert says:
Dear Gym Bunny
It is perfectly possible that the 2 kg increase in weight you have experienced is due to muscle development because muscle tissue weighs more than fat tissue (ironic, but true). If you are training very intensively then you will still need to keep up your food intake, esp of carbohydrates (about 4 g per kg body weight/day) and lean protein (about 2 g per kg body weight per day). Not sleeping enough is, however, a factor that can promote weight gain, so do try to get 8 hours of sleep a night. Click on 'Diet' at the top of this page and do a Search for the article I wrote a few weeks ago on "Sleep yourself thin".
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