Calories burned after excercise!

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I am new to this sight but not to diet and excerise. But this is the first time that I've seen a diet/calorie counter add what you burned off in the gym back on to your intake. I understand you are suppose to eat more when you excercise but when I burn off 400-500 cal working out am I really suppose to eat all of that back? A little confused, would like some feedback! Thanks!

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