A calorie is a measure of energy in a food. For each gram of protein and carbohydrate you'll receive 4 calories, while for each gram of fat you'll get 9 calories. So for each gram you eat if you multiply it by the numbers given before you'll be able to get the rough estimate of how many calories you've eaten.
Your daily caloric intake depends on:
· Age
· Gender
· Body size
· Activity level
Since we are discussing active teens I'll talk about it in terms of such people. You should take note if you aren't that active not to eat as much as a very active person who is always working out because they need more energy to work. When you consider age teens need more calories because they are in their growing stages and need lots of energy to grow up big and strong.
If you are a...
• Teenage girl who is moderately active you should try for 2200 calories a day. If you're very active then you should try for 2400 calories a day.
• Teenage boy who is moderately active you want to eat from 2400 to 2800 calories a day. If you are very active then you want to eat from 2800 to 3200 calories a day.
-www.mypyramid.gov/downloads/mypyramid_calorie_levels.pdf
-http://dayrecipe.com/2010/07/06/food-calorie-tables/
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