https://youtu.be/esPRsT-lmw8 is the youtube talk by Daniel Amen...so check out this talk on what people have learned from seeing 80K plus Brain Scans... I am skimming through this and am not endorsing or promoting it...just sharing the info. Always check with professionals and get second opinions on any procedures and so on. He gives important information about not using drugs to avoid brain damage done by drugs.
Also he shares that Alzheimer's can beginĀ with changes in the brain 30-50 years prior to the symptoms presenting in more obvious ways.