It was from Nature Journal, Molecular Psychiatry, mentions iron burden as an important contributor underlying the brain damage of Alzheimer's disease, which cannot be explained by the presence of amyloid plaques or tau tangles alone.I've heard from various sources they may be linked to Alzheimer's. Wow, cast iron is what I use for most of my cooking.
So if I read it correctly, it does not cause it but can worsen the condition, then again, decades from now they may indicate that it can cause it as well. This is also a source of this topic, although I do not know the validity of the site.
Ironically, I think in the 60s, but do not quote me on time frame, there was a study with women that stopped using cast iron pans, who developed anemia. So too little or too much iron can be a problem.
Personally, I gave up using cast iron due to medical reasons, and switched to a cast aluminum Dutch oven, and purchased pot liners to prevent seepage of metal into my food.