Studies show a clear link between vitamin D and the reduction of colon, breast and ovarian cancer risk. Vitamin D is found in milk, yogurt, cheese and some fortified orange juice—usually 100 international units (IU) a serving. Consider a vitamin supplement to raise your vitamin D intake to 1,000 IU per day. This is especially important for people in winter, when a lack of sunshine curtails the body's production of vitamin D, and for African-Americans, whose skin pigment limits vitamin D production.

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