3 health reasons to cook with cast-iron
Cooking with cast iron fortifies your food with iron.
While cast iron doesn't leach chemicals, it can leach some iron into your food...and that's a good thing. Iron deficiency is fairly common worldwide, especially among women. In fact, 10% of American women are iron-deficient. Cooking food, especially something acidic like tomato sauce in a cast-iron skillet can increase iron content, by as much as 20 times.
http://shine.yahoo.com/channel/food/3-health-reasons-to-cook-with-cast-iron-2574645