What Happens If You Drink a Liter of Strong Coffee in One Sitting (4 Photos)

It is common knowledge that coffee gives you a boost of energy. Many people are also convinced that this aromatic brew is good for your health, though medical professionals might beg to differ. And almost everyone has heard the warning that drinking coffee to excess can put you in an early grave. But is that actually true? How much coffee would it take to drink yourself to death, and what kind of toll does downing a full liter of fresh brew take on your body?





Coffee is usually consumed in modest servings. A standard 30 to 60 ml shot of strong espresso contains between 50 and 100 mg of caffeine. Other, less intense options like Americanos, cappuccinos, lattes, and cortados have even lower concentrations, even though they are served in much larger cups.



Dietitians and nutritionists recommend capping your daily intake at four to six shots of espresso, ideally leaving at least two hours between cups. If you prefer milder drinks, you could technically double that amount, though your teeth and stomach certainly won't thank you.

Truth be told, the caffeine in natural brewed coffee poses virtually no danger to a healthy individual. Synthetic caffeine, such as caffeine sodium benzoate, is a completely different story. This compound is a key ingredient in popular energy drinks and is also sold over the counter in pill form.





In recent years, there have been at least two confirmed fatalities linked to synthetic caffeine. It claimed the life of a 24-year-old Scottish woman who tried to lose weight using diet pills, and a 23-year-old English man who added two teaspoons of caffeine sodium benzoate powder to an energy drink. A single teaspoon of this substance packs the punch of roughly 25 shots of espresso—a massive dose for the human body.

Can You Actually Die from Espresso?

Surprisingly, science has yet to pinpoint a definitive lethal dose of caffeine for humans. It is generally estimated at around 200 mg per kilogram of body weight for individuals weighing up to 70 kg. Based on this, a theoretically lethal dose for an 80 kg man would be roughly 16 grams. However, individual tolerance plays a huge role—some people may succumb to much less, while others can tolerate more.



A full liter of the strongest espresso contains only about 1.6 to 1.7 grams of caffeine—roughly ten times less than a fatal dose. Unless you have a heart condition, high blood pressure, or gastrointestinal issues, drinking a liter of coffee is unlikely to make you seriously ill. In fact, if you are a regular coffee drinker with a built-up tolerance, you might just feel a major surge of energy.

In the worst-case scenario, downing a liter of espresso might trigger a few unpleasant side effects, most commonly a racing heart, restlessness, excessive sweating, and insomnia. But what if you drink a liter of something milder, like cappuccino? Worst-case scenario, you will likely just end up with a heavy, unsettled stomach. Not only is the active caffeine dose in that volume negligible, but the milk or cream also helps soften its impact.