Magnesium may protect against colorectal cancer, according to a study of more than 61,000 Swedish women.

Those who consumed at least 255 milligrams of magnesium a day (from food and supplements) had about a 40 percent lower risk of colorectal cancer than those who consumed less than 209 mg a day. Magnesium had protected against colorectal cancer in earlier animal studies.

What to do: Eat more fruits, vegetables, whole grains, and beans--all of which are rich in magnesium. Multivitamins rarely contain a day's worth--320 mg for women and 420 mg for men--because it wouldn't fit into a single tablet.

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