Gaining some weight is not the end of the world. One trick I learned is to fill up your stomach with vegetables and lean protein. You can live on this stuff without anything else, and it is almost impossible to gain weight on this diet.
You can basically eat endless amounts of vegetables and never gain weight, as the calorie-to-food volume ratio is tiny. (Avoid salad dressing though).
Also, lean protein, like lean poultry, fish, skim milk, etc. can keep you healthy without extra calories.
(I'm a bodybuilder, which is why I know all this crazy stuff)

The only downside of this diet, is that since it has hardly any carbohydrates in it, after a few days you will start craving carbs like they are crack-cocaine. Lol.

anyway, it IS possible to take your AP and not gain weight, absolutely possible. And if you do gain some weight, so what? You are still awesome!

Eat lots of veggies!