Alzheimer... one of the most important diseases confronting humankind

 https://neurosciencenews.com/alzheimers-autoimmune-disease-21456/

We believe that beta-amyloid is not an abnormally produced protein, but rather is a normally occurring molecule that is part of the brain’s immune system. It is supposed to be there. When brain trauma occurs or when bacteria are present in the brain, beta-amyloid is a key contributor to the brain’s comprehensive immune response. And this is where the problem begins.

This leads to a chronic, progressive loss of brain cell function, which ultimately culminates in dementia — all because our body’s immune system cannot differentiate between bacteria and brain cells.

Some maintain that it is the end-result of a particular brain infection, with bacteria from the mouth often being suggested as the culprit. Still others suggest that the disease may arise from an abnormal handling of metals within the brain, possibly zinc, copper or iron.