alt Hacker NewsYou don’t have Parkinson and you probably don’t take that much coffee
Usual espresso from 42mm puck is 18g of coffee beans in, something around 40g of total coffee out. This has 90…150 mg of caffeine. The study focused on people having more than 300 mg daily.
So don’t drink more than 2 cups per day and you’ll be fine.
Also don't smoke or do any of the other things this study didn't control for but do correlate with caffeine consumption in the general population.