In a little known study from 1965, researchers measured the iron content of 7 foods cooked in cast iron or glass. Acidic foods and those cooked for longer periods of time accumulated the most iron.

But when the Aldi Special Buy cast-iron cookware goes on sale, it's hard to resist picking one up for just $26.99, even if you already have a near-identical Kmart pot sitting on the bench at home. So ...