Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults. That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks. Keep in mind that the actual caffeine content in beverages varies widely, especially among energy drinks.
Most doctors recommend capping daily caffeine intake at 400 mg, which is equivalent to about four cups of coffee. This is because studies of energy drinks suggest that drinking caffeine can cause acute spikes in blood pressure and arterial stiffness and can result in emergency room visits and even deaths.
“Symptoms of too much caffeine include restlessness, shakiness, rapid or irregular heartbeats, headache, irritability and insomnia,” says Dr. He. The good news is that most of these symptoms, unpleasant as they are, won't endanger your life. Cardiovascular symptoms, on the other hand, require vigilance.
One way is to take a week off from coffee every month. That's what Ashley Richmond, the founder of Momentum Habits, does. She recommends taking the first week of the month off so it's easy to remember. If that sounds too harsh, try the slower approach.
Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults. That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks.
Healthy adults shouldn't consume more than 400 milligrams (mg) of caffeine per day. That's equal to about four 8-ounce cups of brewed coffee or 10 cans of cola. Teens should limit their caffeine intake to less than 100 mg per day (one 8-ounce cup of coffee or about two cans of cola).
And studies show coffee may protect against liver disease. Most of the benefits are thanks to antioxidants. A large 2021 study found that drinking coffee was associated with a lower risk of liver disease. Effects were similar for both regular and decaf coffee.
It also depends on whether your body is used to getting regular doses of caffeine and how much you have in one serving. Research suggests that 400mg per day or less is an acceptable dose of caffeine for the general population. Approximate caffeine levels per serve include: chocolate drinks: 5–10mg per 250ml.
Coffee has a ton of yummy nutrients for your skin. It's full of powerful antioxidants like polyphenols and flavonoids that help protect against sun damage and fight off free radicals. The caffeine in coffee is vasoconstrictive — it constricts blood vessels to reduce inflammation (see ya later, puffiness!).
Drinking coffee in moderate amounts (about 4 cups daily) is likely safe for most people. Drinking more than 4 cups of coffee daily is possibly unsafe. Drinking large amounts might cause side effects due to the caffeine content.
Coffee contains several compounds that act as prebiotics, meaning they help nourish beneficial bacteria in the digestive system by providing them with nutrients necessary for growth and function.
What's the better choice, coffee or tea? “Neither is particularly harmful, and both offer an abundance of potential health benefits. Like most things in life, it comes down to portion control and individual preference,” Bollig said. If you aren't sensitive to caffeine, both are considered healthy.
According to the FDA, 400 mg per day of caffeine (that's about four cups of coffee) is a safe amount of caffeine for healthy adults. But too much caffeine–500 to 600 mg–can be dangerous, causing restlessness, tremors, irritability, insomnia and stomach upset.
Long-term effects at this level may include chronic insomnia, constant anxiety, depression, and stomach problems. It can also cause high blood pressure or make high blood pressure worse. More than 300 mg of caffeine (about 2 to 3 cups of coffee) in a day may be linked to miscarriages and low-birth weight babies.
Drinking coffee—particularly two to three cups a day—is not only associated with a lower risk of heart disease and dangerous heart rhythms but also with living longer, according to studies being presented at the American College of Cardiology's 71st Annual Scientific Session.
And so for 25 years Honoré de Balzac drank about 50 cups of coffee per day to achieve his greatest moments. Nowadays, you should all know that this was an unhealthy addiction and consuming that amount of coffee a day is simply dangerous.
Honore de Balzac, a nineteenth-century French writer, drank the equivalent of around 47 cups of coffee A DAY for 25 years.
The level of caffeine in your blood peaks about one hour later and stays at this level for several hours for most people. Six hours after caffeine is consumed, half of it is still in your body. It can take up to 10 hours to completely clear caffeine from your bloodstream.
The body releases cortisol first thing in the morning, which clashes with caffeine. Waiting until the stress hormone's effects decrease will help you benefit more from the caffeine. Research suggests the optimal time to wait would be between one and four hours.
Indeed, according to experts, drinking coffee on an empty stomach right after waking up can interfere with your cortisol levels and actually leave you feeling even more tired later on in the day.
The short-and-sweet version is that most experts recommend setting your caffeine cutoff for 2 or 3 p.m. While there's plenty of research showing that caffeine disrupts sleep, only one study has examined how the timing of caffeine intake affects sleep.