Those who drank more than six cups of coffee per day had a 53% increased risk of dementia, as well as smaller brain volume.
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That explains a lot - I used to drink a quart or more of Espresso a day while fishing commercially.
for 30 years
I make my coffee from very dark/espresso beans, but run some additional water through, so it comes out like heavy-duty coffee but not true espresso. And I use the equivalent of 4 "shots" worth, all in one big 16-oz cup. That's my one "cup" of coffee for the day, but it's a serious cup. LOL
So average cup size for coffee is 6 oz per cup. That means in excess of 36oz is potentially hazardous to your brain health. I guess I’m good at my 36 oz mug.