I worked with a guy researching the functional basis of Alzheimer's synthesizing many radiological technologies.

It is likely a multi-factor pathological degenerative condition with many, many potential precipitating (no pun intended) causes, both nature and nurture.

"The cure" is more than likely a holistic combination of many early lifestyle modifications including, but not limited to: diet, sleep, exercise, gene therapy, immunotherapy, medications, and supplements.