Here's what the maximum amount of caffeine you should be drinking in a day looks like

And you thought Red Bull was bad.

It turns out that while a can of the energy drink has 80 milligrams of caffeine, a small cup of Starbucks drip coffee has more than three times that amount.

Since many beverages don't show their caffeine content, it can be tough to make sure you're not overdoing it - and the Mayo Clinic advises adults to limit their caffeine intake to 400 mg per day. More than that and you run the risk of unpleasant side effects ranging from migraine headaches to irritability, upset stomach, and even muscle tremors.

With that in mind, here's what the maximum amount of caffeine you should be drinking in a day looks like in the context of your favorite beverages, from McDonald's coffee to soda, tea, and energy shots: