Do you think Alzheimer disease involves natural selection or epigenetic process? Or both.

Answer 1

It's actually unknown exactly where Alzheimer's diseases comes from. It is thought to be a mixture of genetics and epigenetics. Additionally, there are different forms of Alzheimer's (ex early onset) which may be more heritable than the other types.

Tl;dr: It is both genetics and environmental/epigenetics. The degree by which it is genetic/environmental depends on an individual's form of alzheimer's and unique situation.

Here is a good website for more information: https://www.nia.nih.gov/health/alzheimers-disease-genetics-fact-sheet