Can you tell me some foods which are beneficial for long lasting time? and i eat a lot of junk fast food so please tell me the way to balance it.

Vegetables & fruits: The healthiest foods to eat are fresh vegetables & fruits (though best fruits are less sweet ones like berries, cherries, citrus & apples), preferably organic.But nothing will totally balance the damage caused by junk food- esp. Try to limit deep-fried foods & sodas- these are the least healthy of all foods. See http://www.Drfuhrman.Com/library/foodpyramid.Aspx to learn more about healthy choices.

Eat healthy fats: Fats take longer to digest than carbohydrates. If you eat foods with nuts in it, you will feel fuller longer. Plus they have more protein which is good for you as well.