[ashtami8]

@clumsysmurf, nice catch!

Could it be possible that the coffee lobby is behind this 'counter'-study?, since a relatively simple inference from the OP has catastrophic consequences for the coffee business:

Deep sleep is necessary for the slow electrical waves that clear the brain of waste including amyloid proteins. (Excessive) coffee intake reduces the quality and quantity of deep sleep, thus leading to a build up of waste products including amyloid, resulting in cognitive declines such as Alzheimer's etc. Therefore, coffee intake (indirectly) causes Alzheimer's.

Admitting that last part is suicidal for the coffee business.

[ashtami8]

@dukeyukey, from these '_lot_ of studies', if we remove those that are directly or indirectly funded by the coffee lobby, are we left with the empty set ∅ ?

[dukeyukey]

Do you think I would have posted that if what you say is true?

[dukeyukey]

We have a _lot_ of studies and evidence that says coffee reduces overall mortality by quite a bit, and it holds for both caffeinated and decaf coffee. It seems like coffee specifically reduces the risk of Alzheimer's as well.

[darthrupert]

That result is almost certainly bullshit, at least for Alzheimer's. Or the effect is so minimal that it doesn't practically matter.

Why? Because Finland is the country that consumes the most coffee per capita in the world. Finland also has the highest amount of Alzheimer patients per capita. Correlation is not causation, but based on this, it should rather be suspected that coffee causes Alzheimer's rather than helps with it.

[sydbarrett74]

Could Finland's high incidence of Alz also have to do with its high latitude and Finlanders' lack of Vitamin D?