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“I think the notion of ‘calories in vs. calories out’ is ridiculous.” So begins a recent online article about diet. Typically, it cites no external sources of information for this opinion. Actually, the calories in – calories out equation is a truism; thermodynamics doesn’t make exceptions, and one way or another, those input calories have to go somewhere. But the thought underlying the denial of equivalence is usually something different, such as, why does my friend eat anything she likes and stay slim, when I can’t?Read the rest “Calories in equals calories out?”