to grow and reproduce
2000 to 2500 calories! they need to grow at these age! :]
2100-2200 Calories is what you need every day. Don't worry about calories so much at this age, eat eat eat to grow grow grow!
Regular calories are better. You need calories to survive, you don't need that much fat (consumed fat, that is) to live.
A 13 year old boy needs alot so he can grow the becom a big boy he actually needs 1500-2000 calories a day deppending on his size.
Lots.
He doesn't need any calories. He has 3 SuperBowl rings.
you need 7000 calories to lose 1 kg
we need calories for energy, for your body to move. Your heart and lungs need energy to function, as does your brain and all of your organs.
Eat meals more frequently, gain weight, in-turn your body will need more calories to stay at the same weight (or continue to grow) therefore making you want and need to eat more.
About 2,000 calories or so.
Girls (teenage) : need about 1800 to 2200 calories each dayBoys (teenage) : need about 2200 to 2800 calories each dayThe extra calories may be stored as fat. Individuals vary greatly in their ability to metabolize extra calories and/or fat.