JUNE 2018 – Calories in vs. calories out—i.e., eating fewer calories than you burn off—has been an accepted weight loss formula for decades. And on its face, it seems to make sense. But a growing body of research is proving what frustrated dieters have already discovered: It’s just not that simple.

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JANUARY 7, 2016 – LUDWIG often uses an analogy when he talks about weight loss: Human beings are not toaster ovens. If we were, then the types of calories we consumed would not matter, and calorie counting would be the most effective way to lose weight.

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August 15, 2016 – Heather Reyes has spent the better part of the last decade struggling to lose the 40 extra pounds she gained in her early 20s and the weight she put on during her pregnancies. The Aurora, Illinois, mother of two counted calories ad nauseum, at one point losing 30 pounds during a stint on Weight Watchers. But inevitably her willpower would fade. As soon as she strayed from her diet, she says, “the floodgates would open,” and the pounds would creep back on.

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