Cao Xiaoli, a professional acrobat, practices balancing on one hand in the practice room at Shanghai Circus World in Shanghai, China. (From the book What I Eat: Around the World in 80 Diets.) The caloric value of her day's worth of food on a typical day in June was 1700 kcals. She is 16 years of age; 5 feet, 2 inches tall; and 99 pounds. Cao Xiaoli lives in a room with nine other girls. She started her career as a child, performing with a regional troupe in her home province of Anhui. Now she practices five hours a day, attends school with the other members of her troupe, and performs seven days a week. She says what she likes best about being an acrobat is the crowd's reaction when she does something seemingly dangerous. MODEL RELEASED.