Reminds me of one funny probably-not-taken-very-seriously historian theory about Alzheimer's - that air pollution was responsible for its existence and the few

Reminds me of one funny probably-not-taken-very-seriously historian theory about Alzheimer's - that air pollution was responsible for its existence and the few natural sources were rare enough that there weren't any 'got Alzheimer's by spending too much time by an erupting volcano' cases. The main reason being the lack of pre-industrial accounts of anybody being old enough to show memory issues. It isn't strong proof by any other means. The bias of the accounts excluding it would sort of be like concluding that acne wasn't an issue because painted portraits of teens excluded them. I don't know if this theory is true but it is certainly an interesting one.