Ahm doc, what daily calorie intake do you recommend for an 18 year old teen guy?

Balanced Diet: Calorie requirements should be based on age, ht/wt, activity level, and your goals. In addition to total calories, also need to consider nutrient sources and timing of meals. Regardless diet should be rich in fresh vegetables, fruits, and lean protein sources. Mayo offers basic calorie calculator @ http://www.Mayoclinic.Com/health/calorie-calculator/nu00598.