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Karsal, a nomadic yak herder, with his typical day's worth of food inside the family's yak-wool tent in the Tibetan Plateau. (From the the book What I Eat: Around the World in 80 Diets.) The caloric value of his day's worth of food in June was 5,600 kcals. He is 30 years of age; 5 feet, 6 inches tall; and 135 pounds. A pile of yak dung, used for fuel, looms in the background. MODEL RELEASED.