Men who consume more iron from meat may have a higher risk of gallstones than men who consume less.

Researchers tracked more than 45,000 men from 1986 to 2002. Those who got the most heme iron--the kind that's found in meat, poultry, and seafood--had a 20 percent higher risk of gallstones than those who got the least. Iron from other foods or from supplements--called non-heme iron--had no impact on gallstone risk.

What to do: It's too early to be sure that heme iron promotes gallstones. But in any case, it's worth avoiding too much red meat--which has more than poultry or seafood--to reduce the risk of colon and prostate cancer, as well as heart disease.

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