Eating Eggshells for Calcium?

As I mentioned in my last post, I’m trying to reduce the number of supplements I take (and hence, supplement packaging) by getting my nutrients from whole foods instead of pills. So a few weeks ago, I was wondering aloud (apparently, I’ve started talking to myself a lot lately) about how I could get more calcium, and Michael, whose mind goes all sorts of random places, said, “You eat an egg everyday. Why not eat the shell, too?” He wasn’t serious. But I wondered if eating eggshells was a...