1. Snacking is important. By eating small meals or snacks throughout the day, you will keep your metabolism up and running to burn the calories you eat. Smart snacking means cutting out the vending machine chips and candy bars and adding in the granola, bagged fruits or veggies, protein bars, or nuts.
2. Depending upon the amount of physical activity you do, you can calculate how many calories per day are healthy for your weight and lifestyle. For teens, the average recommended caloric intake is 2,100 calories, but it is important to base your diet on your activity.