You can take a few simple steps to prevent or slow bone loss Pay attention to vitamin D. Your body needs vitamin D to absorb calcium. For adults ages 19 to 70, the RDA of vitamin D is 600 international units (IUs) a day. The recommendation increases to 800 IUs a day for adults age 71 and older. Good sources of vitamin D include oily fish, such as tuna and sardines, egg yolks and fortified milk. Sunlight also contributes to the body's production of vitamin D. If you're worried about getting enough vitamin D, ask your doctor about supplements. For more tips on what you can do to keep your bones healthy, visit your campus wellness nurse or click the link for other helpful suggestions. Courtesy of the Mayo Clinic.