NL Prodromal AD Mild AD Dementia
The video below (by the NIH -- National Insitutes of Health) captures the essence of the
"amyloid hypothesis", the current main theory regarding the molecular basis for Alzheimer's.
It may or may not prove to be the correct main hypothesis → it is the starting point for most current clinical scientific research.
... for more of the science
(TIP) Link to their links...
to delve deeper