I understand that in order to GAIN a pound it requires 3500 calories of unspent energy in the body. Therefore, to LOSE a pound you'll need to burn off 3500 calories, or 500 calories a day to lose a pound in a week. I wouldn't focus on calorie consumption as much as I would on burning an extra 500 calories a day.
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The number of calories per day for a 17-year-old girl or boy depends on such things as body weight, health, and level of activity. It also depends on whether the 17-year-old needs to:
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Anyone considering a weight loss diet should consult a nutritionist or physician.
If your a man then 2500 calories.
If your a woman 2000.
I would add though, that a smaller sized person would need less, say 2000 for a smaller man and 1500 for a smaller woman.