4 Cups a Day: 4 Surprising Health Benefits of Drinking That Much Coffee

Altschmied and Haendeler, both University of Dusseldorf biologists, say that four cups a day can actually help heart cells function more efficiently, as that amount of caffeine will push a protein called p27 into the mitochondria of heart cells.

It s not the only health benefit. It s known that four cups or more of coffee lowers the risk for heart attack, stroke, and diabetes, says Altschmied. So the next time you re worried about grabbing that late afternoon cuppa, remember these health benefits that come with four cups of coffee.

via getpocket.com

Sounds about right to me.