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That was the conclusion of a 2022 study published in the Annals of Internal Medicine, which found that drinking 1.5 to 3.5 cups of coffee a day was associated with a lower risk of mortality ...
The researchers reported that 400 mg of caffeine is roughly equivalent to four cups of coffee, 10 cans of soda, or two energy drinks. They reported that nearly 20% of the study participants ...
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.
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]
It compared people who drink less than 100 milligrams of caffeine per day with those who drink a moderate amount of caffeine, which the writers qualified as either three cups of coffee, or between ...
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]
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."
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.