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Lourdes Alvarez, a restaurant owner and chef with her typical day's worth of food in her family's Mexican restaurant, Los Dos Laredos in Chicago. (From the book What I Eat: Around the World in 80 Diets.) The caloric value of her typical day's worth of food on a day in the month of September was 3,200 kcals. She is is 39 years of age; 5 feet, 2.5 inches tall; and 190 pounds.   She grew up in an apartment above Los Dos Laredos, where she still helps out two days a week. Other days she spends long hours at her own restaurant in Alsip, Illinois. At right: Lourdes takes a phone order, while her daughter, Alejandra, checks her mobile phone after school. MODEL RELEASED.