Berry’s conversion experience is typical of many of the physicians I interviewed. He started putting on excess fat in his mid-thirties and believed (based on what he described as the “four hours of nutrition education we got in medical school”) that “if you want to lose weight you create a calorie deficit.” He assumed that if he religiously followed this “state-of-the-art” wisdom, it would fix him. It didn’t. “So now I looked like a fat lazy doctor, with stiff joints and reflux and allergies,” he told me. “I felt like shit all the time, and I’m supposed to go into a patient’s room with my gut
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