American Heart Association to coffee fans: Go ahead and have 5 cups a day (as long as you also do this)

What’s the most widely used psychoactive substance in the world? It’s not alcohol, cannabis, or nicotine. It’s caffeine. At least 85% of Americans consume some form of the entirely legal drug every day. Clearly, we’re a nation in love with our morning cup (or three) of coffee. But as common and beloved as caffeine is, it can also be controversial, with experts arguing over its health impacts and how much is too much. That leaves many of us slurping away each morning, but secretly anxious tha...