Correct, as humans evolved, parasitic infections increased. The APOE gene was a method of slowing down or stopping parastic infection to the brain. "Among the

Correct, as humans evolved, parasitic infections increased. The APOE gene was a method of slowing down or stopping parastic infection to the brain. "Among the Tsimane as a whole, adults with APOE4 got poorer scores in these tests. But when the team focused on the people with high parasite levels, they saw that the APOE4 carriers had better mental skills, even outperforming APOE3 carriers who were parasite-free." https://www.theatlantic.com/science/archive/2017/01/why-does-a-gene-that-increases-alzheimers-risk-still-exist/512396/ https://www.theatlantic.com/science/archive/2017/01/why-does...