The calorie is an energy unit that indicates how much energy you get from food.
On a food label, the percentages are based on an average person who needs 2,000 calories of food energy a day. If you are a growing teen who participates in sports, and is very active, you may need more than that. Some teens may need less than 2,000 calories. Your doctor can help you find a healthy range of calories based on your needs and activity level.