Determining how many calories you need depends on your fitness goals, whether you are a marathon runner or a weightlifter. Use intake formulas to calculate your needs for muscle gain or sustainable weight loss.
Calories provide energy you need for daily activities. When trying to lose weight, the calories you take in should be less than the calories you burn, but there is a limit beyond which you should not go unless you're under medical supervision.
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You weight determines the number of calories you need to maintain that weight. With that number, you can calculate how many calories you need to gain or lose weight, too.
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