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How many calories do you need?

Calorie table with figures for boys and girls at different ages.
Recommended daily calorie intake for boys and girls at different ages

If you're calorie counting then in order to lose weight, you first need to find out how many food calories you, your very own self, need on a daily basis in order to lose weight. This will be different from person to person depending on things like how old you are and whether you're a girl or a boy.