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The FDA’s recommendations regarding daily caffeine consumption for adults are uncomfortably noncommittal. Their 2023 report states that 400 milligrams a day is “an amount not generally ...
The Food and Drug Administration recommends people cap their daily caffeine intake at 400 milligrams, or about four or five 8-ounce cups of coffee.
In fact, the FDA estimates toxic effects, like seizures, can be observed with rapid consumption of around 1,200 milligrams of caffeine, or 0.15 tablespoons of pure caffeine.
The FDA recommends most people limit their daily caffeine intake to no more than 400 mg of caffeine per day. One 8 fluid ounce cup of brewed coffee has around 96 mg of caffeine.
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]
The risk was reduced by 48.1% if they had three cups a day, or 40.7% if they had 200 to 300 milligrams of caffeine daily, compared with people who didn’t drink or drank less than one cup, Ke said.
Caffeine-induced anxiety disorder is a subclass of substance- or medication-induced anxiety disorder. [35] Populations that may be most impacted by caffeine consumption are adolescents and people with anxiety disorders. [36] Preliminary research indicated the possibility of a beneficial relationship between coffee intake and reduced depression.
According to the FDA, most adults should stick to a daily caffeine limit of 400 milligrams, meaning a drink like Celsius consumed before a workout gets you halfway to your recommended max dose.