Clueless about "Alzheimer's Disease"!

I am watching a news report about people examining brains to find a CURE for "Alzheimer's Disease" - rather than to actually FIND "Alzheimer's Disease." W.T.F.???

[What is the difference between "Dementia" and "Alzheimer's" ?????
Is it a posh euphemism for a deteriorating lifestyle??.......
Where the feck is the (biological) illness??.......]

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The above just find this very hard to believe. Tests my faith in the human intellect.

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A DISEASE = A DISEASE = A DISEASE =
"a demonstrable defined biological process, lesion, infection etc."

"SYMPTOMS"                    DO NOT=/ A DIAGNONSENSE......
"SYMPTOMS"                    DO NOT=/ A DISEASE........
"TREATMENT"                  DOES NOT =/ A DISEASE.....

Who was Alzheimer?
And where the feck did he leave his disease??? - coz no fecker can find it!!!.....