once your off cycle you will actually need to eat a bit more to maintain gains as best you can. your protein requirement will go up, because without AAS your body is no longer going to be as efficient at using it. your fat and vitamin d intake will need to go up, as your body will have to begin making hormones on its own and not rely on it coming from a needle.
however your carbohydrate intake can go slightly down, as your body will no longer be able to use that much glucose as it can while on cycle .

up your protein and fats while on PCT and keep your calories high and keep training hard and heavy (give your body a reason to hold onto the muscle)