It's not just about calories in versus calories out.
If that were all it took to lose weight — eating a little less and exercising a little more — then weight loss would be as simple as grade-school math: Subtract Y from Z and end up with X.
But if you've ever followed a diet program and achieved less than your desired result, you probably came away feeling frustrated, depressed, and maybe a bit guilty. What did I do wrong?
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