I can only agree that coffee has a prophylactic effect against Alzheimer's disease. Coffee is a controversial product: it is popular. People want to drink it, so no money is spared for scientific research that could rehabilitate and even endow the drink with new properties. Everything rests on common sense and personal choice. I choose it, but only in a frenchpress and from good beans. I recommend that lovers research this information https://www.coffeeinformer.com/best-coffee-for-french-press/. If coffee makes life better, drink it, don't worry too much about how healthy the drink really is.