SOURCES: American Academy of Orthopaedic Surgeons: "Weight-Bearing Exercises for Girls and Young Women." Dietary Guidelines for Americans 2005. Medline Plus: "Vitamin D." National Institute of Arthritis and Musculoskeletal and Skin Diseases: "Exercise for Your Bone Health," "Calcium Supplements: What to Look For," and "Calcium and Vitamin D: Important at Every Age." WebMD and The Cleveland Clinic: "Osteoporosis." WebMD: "The Dairy Foods Chart."

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