Dr. Richard Johnson is a professor of medicine at the University of Colorado, and is a clinician, educator, and researcher. For more than 20 years, he has led research on the cause of obesity and diabetes, with special interest in the role of sugar (especially fructose) and uric acid. His latest book, Nature Wants Us to Be Fat: The Surprising Science Behind Why We Gain Weight and How We Can Prevent—and Reverse—It, is out now.

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