One in three adults in the U.S. is obese, and that doesn't account for the simply overweight. But many people still don't know what's actually making us fat. Is overeating to blame? Calorie counting gone awry? Too many carbohydrates? We talk with nutrition and food expert Marion Nestle about her new book, "Why Calories Count: From Science to Politics."
Marion Nestle: 'Why Calories Count'
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Marion Nestle, author, professor of nutrition, food studies and public health at New York University and author of "Food Matters" for The San Francisco Chronicle