People always say you are what you eat, but perhaps that isn’t true. I am under the suspicion that you can eat whatever you want in an exercise program as long as you keep it in moderation.
If you count your calories and you’re getting a healthy amount of proteins, carbs, and fats then you have no need to sweat the fact that you got them from Taco Bell or a steak with vegetables. A calorie is a calorie, a carb is a carb, and just eat! Enjoy yourself whether your goal is to lose weight or gain it!