Jeff Volek, a professor in the Department of Human Sciences at Ohio State University in Columbus and an advocate of high-fat diets, argues that humans evolved to eat fat over carbohydrates: “Early humans, the hunter-gatherers, who were quite physically active, primarily ate fat. It’s been the main fuel for active humans far longer than carbohydrates have been.” To gain the benefits of fat as a fuel for better sports performance, Volek recommends a diet close to 85 percent fat and almost no carbohydrates. Such a diet leads to a condition called ketosis, where the body creates molecules called
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