What kind of diet does a teenager have?

Have to consume good amount of fats, proteins and carbs from your daily calories, calorie intake depends upon your height, weight and activity levels.
If you are trying to lose weight you should take mostly 60 grams of fats from your daily calorie intake else it can be 80-100 grams (1 gram of fat contains 9 calories).
The standard method used by the nutritionists to estimate the protein requirement is, we have to multiply our weight by 0.37(if weight in pounds), else multiply by 0.8(if weight in kilo grams). The result will be your protein requirements (in grams) per a day and the remaining will be carbs and others.