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According to Yawitz, “most healthy teens can safely consume up to 100 milligrams of caffeine daily,” which basically amounts to 24 ounces of soda or one eight-ounce cup of coffee. Or half a ...
The U.S. Food and Drug Administration (FDA) says that most people can tolerate up to 400 milligrams of coffee a day—that lines up to between two and three 12 oz cups of the good stuff each day ...
A standard cup of coffee can contain anywhere from 95 to 200 mg of caffeine. The FDA cites 400 mg of caffeine per day "as an amount not generally associated with dangerous, negative effects." But ...
The health effects of coffee include various possible health benefits and health risks. [ 1 ] A 2017 umbrella review of meta-analyses found that drinking coffee is generally safe within usual levels of intake and is more likely to improve health outcomes than to cause harm at doses of 3 or 4 cups of coffee daily.
Caffeine dependence can cause a host of physiological effects if caffeine consumption is not maintained. Withdrawal symptoms may include headaches, fatigue, difficulty concentrating, lack of motivation, mood swings, nausea, insomnia, dizziness, cardiac issues, hypertension, anxiety, backaches, and joint pain; these can range in severity from mild to severe. [18]
For reference, a brewed 8oz (227ml) cup of coffee contains ~95 mg of caffeine (per USDA). [6] According to the Diagnostic and Statistical Manual of Mental Disorders, caffeine overdose can result in a state of excessive stimulation of the central nervous system and the essential feature of Caffeine Intoxication is the recent consumption of caffeine.
Researchers say consuming more than 400 milligrams of caffeine per day could raise the risk of cardiovascular disease. Excessive caffeine from coffee, tea, energy drinks, and other beverages may ...
High caffeine consumption in energy drinks (at least one liter or 320 mg of caffeine) was associated with short-term cardiovascular side effects including hypertension, prolonged QT interval, and heart palpitations. These cardiovascular side effects were not seen with smaller amounts of caffeine consumption in energy drinks (less than 200 mg). [79]