The Ache: Lack of dietary iron reduces production of the blood protein hemoglobin, resulting in iron-deficiency anemia, a condition marked by extreme fatigue. While iron deficiency is more common in developing countries than in the U.S., women, children, vegetarians and blood donors are at greater risk.

The Claim: Cast-iron pots and pans release iron into your food. Cooking in them is an inexpensive and convenient way to add the mineral to your diet, some scientists say.

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