Could you tell me what good sort of diets is there for teenagers..?

Balanced: Teenagers are growing rapidly and require many nutrients. The ideal diet is well-balanced, with complex carbohydrates, protein, unsaturated fats, and vitamins/minerals. The details are too long to provide here, but a great resource is: http://www.Choosemyplate.Gov/. This will help you decide what's best to eat based on age and gender.