In a recent interview, Keurig Dr Pepper’s CEO Tim Cofer told Fortune that he always starts his day at 5:30 a.m. with a fresh cup of coffee. By 6:30 a.m., he’s already finished his second. At lunchtime, he likes to have a carbonated soft drink—which is often caffeinated—before shifting to an energy drink to keep him going during the afternoon.

“I’m a big coffee drinker. Seven days a week,” he said. He’s not alone; nearly 75% of Americans enjoy a cup of joe daily.

While Cofer’s total caffeine intake would vary depending on what kind of soda and energy drink he’s reaching for, when you add it all up he’s likely hitting between 300 and 450 milligrams of caffeine per day. You might be thinking, “That’s a lot of caffeine.” But is it too much?

How much caffeine is too much?

Caffeine is a stim

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