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 Eric Helgas for The New York Times # How Much Coffee Is Too Much Coffee? Coffee has many health benefits, but most of its risks come from caffeine.  Elizabeth Cecil for The New York Times Consuming too much caffeine can cause your heart to race, jitteriness, nausea or trouble sleeping. It can also lead to headaches, acid reflux and, at high enough doses, tremors or vomiting. It’s rare to experience any dangerous side effects from drinking coffee. In most cases, you would need to consume at least 10,000 milligrams of caffeine — the equivalent of about 50 to 100 cups, depending on the strength — for it to be potentially fatal.  Bobbi Lin for The New York Times Studies show that habitual coffee drinking does not seem to raise blood pressure or the risk of an abnormal heart rhythm in the long run. That said, if you’re prone to abnormal heart rhythms, you may be more sensitive to caffeine's effects and should not consume more than you’re used to. Most adults can safely consume 400 milligrams of caffeine per day — the equivalent of about four eight-ounce cups of brewed coffee, or six espresso shots — according to the Food and Drug Administration. If you’re pregnant, the American College of Obstetricians and Gynecologists recommends no more than 200 milligrams.  Eamon Queeney for The New York Times Keep in mind that cup sizes and coffee strengths can vary. A typical eight-ounce cup contains about 80 to 100 milligrams of caffeine, according to the FDA. But at Starbucks, a “tall” (12-ounce), medium-roast brew contains around 235 milligrams — about the same as a triple shot of espresso.  Pay attention to your response to caffeine. If you begin to experience even mild symptoms or it’s affecting your sleep, cut back. [Learn more](https://www.nytimes.com/2023/09/26/well/eat/coffee-benefits-caffeine-risks.html?gws_id=nyt%3A%2F%2Finteractive%2F9ad09a1c-437c-4664-b7a8-a73c95b0c586&gws_card=7) [Openinghttps://www.nytimes.com/2023/09/26/well/eat/coffee-benefits-caffeine-risks.html?gws\_id=nyt%3A%2F%2Finteractive%2F9ad09a1c-437c-4664-b7a8-a73c95b0c586\&gws\_card=7](https://www.nytimes.com/2023/09/26/well/eat/coffee-benefits-caffeine-risks.html?gws_id=nyt%3A%2F%2Finteractive%2F9ad09a1c-437c-4664-b7a8-a73c95b0c586&gws_card=7)

Eric Helgas for The New York Times Coffee has many health benefits, but most of its risks come from caffeine. Consuming too much caffeine can cause your heart to race, jitteriness, nausea or trouble sleeping. It can also lead to headaches, acid reflux and, at high enough doses, tremors or vomiting. It’s rare to experience any dangerous side effects from drinking coffee. In most cases, you would need to consume at least 10,000 milligrams of caffeine — the equivalent of about 50 to 100 cups, depending on the strength — for it to be potentially fatal. Studies show that habitual coffee drinking does not seem to raise blood pressure or the risk of an abnormal heart rhythm in the long run. That said, if you’re prone to abnormal heart rhythms, you may be more sensitive to caffeine's effects and should not consume more than you’re used to. Most adults can safely consume 400 milligrams of caffeine per day — the equivalent of about four eight-ounce cups of brewed coffee, or six espresso shots — according to the Food and Drug Administration. If you’re pregnant, the American College of Obstetricians and Gynecologists recommends no more than 200 milligrams. Keep in mind that cup sizes and coffee strengths can vary. A typical eight-ounce cup contains about 80 to 100 milligrams of caffeine, according to the FDA. But at Starbucks, a “tall” (12-ounce), medium-roast brew contains around 235 milligrams — about the same as a triple shot of espresso. Pay attention to your response to caffeine. If you begin to experience even mild symptoms or it’s affecting your sleep, cut back.