To determine your daily caloric intake, you need your bastal metabolic rate. Bastal metabolic rate (or BMR) is the minimum amount of calories you need in order to live in a resting position. It's possible for your BMR to use up to 70% of the total amount of calories that you use. Those calories are what power all of your necessary body functions (breathing, pump blood, maintaining body temperature etc.) Here's a formula to calculate your BMR
Girls: BMR = 655 + ( 4.35 x weight in pounds ) + ( 4.7 x height in inches ) - ( 4.7 x age in years )
On average, Regular Teen girls from the ages:
* 11-14 need about 2200 calories a day
* 15-18 also need about 2220 calories a day
But athletic teen girls need about 3000 calories a day.
Boys: BMR = 66 + ( 6.23 x weight in pounds ) + ( 12.7 x height in inches ) - ( 6.8 x age in year )
Regular teen boys from the ages:
* 11-14 need about 2500 calories a day.
* 15-18 need about 3000 calories a day.
But athletic boys need up to 5000 calories a day.
Now you may be wondering why boys need more calories than girls. Well, the answer is that boys tend to burn off more calories while in physical activities than girls do. Since they boys burn off more calories, they need to eat a higher amount of calories to replenish what was lost.
http://www.runnersworld.com/article/0,7120,s6-393-397--11818-0,00.html http://www.bmi-calculator.net/bmr-calculator/bmr-formula.php
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