There are some signs that heat stress hormones may protect against Alzheimer’s.

They studied a family in which early onset Alzheimer’s was strongly prevalent. In the subject’s family tree, 32 cases, but he was older than his deceased relatives at the time they developed symptoms, despite carrying the markers. The only thing they could track down was that he had an elevated level of heat stress proteins in his blood and brain, and they seemed to be slowing down plaque buildup. More study needed.