It's not exactly breaking news that coffee helps you stay alert. But how much coffee gets you to the right level of alert . . . without going TOO far or not far enough?
A new study out of Portugal found the exact number of cups of coffee you should drink in a day is . . . FIVE.
That's the point where you'll be the most alert . . . and also, your memory will be better and you'll learn stuff faster. So start throwing 'em back.