I have been thinking about supplementing my calcium intake with egg shells but it worries me that I can't find any examples where they were eaten traditionally. Are there any examples? What would be the reason for this? Are there any possible negative effects from eating the shells?
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Yes, chicken cultures from all the world eat egg shells sometimes.
Are there any possible negative effects from eating the shells
Yes, few - salmonela for one, blood vehicle calcification for two, muscle jerks for three and I wouldn't exclude angry chickens too.
HGs probably ate eggshells occasionally, but the only thing I could find on them was that they were sometimes used to carry water. If you're using them as a canteen, they'd probably be too valuable whole to eat. There were references to jewelry, but I didn't follow those since they weren't food related.
To grind them into a powder, although not difficult, would probably give poor results if you're using a grinding stone like some modern tribes do with grain - too few shells, lots of grit.
When we scramble eggs, we drop the entire egg, shell and all, into a blender. No problems and the shell pieces are too small to notice.
Ray Peat actually recommends boiling them. I would never eat eggshells, boiled or not. But, yes, they're supposed to be good source of calcium.