Make sure that you always have fruits in your house. Whenever you feel hungry, have an apple or banana. A glass of low fat milk will also help you. You will need carbs and fiber after training, so the idea is to have good carbs like fruits, milk, whole wheat bread etc.
Stay away from those junk, fatty, deep fried food after training. It will offset all the training you did.
As dokie suggested, have 4-5 meals in small portions every day.

Happy training!

- Shiv