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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.
“While the average half-life of caffeine is between three and seven hours, people with a slower metabolism or liver problems may experience the effects of caffeine longer, and more acutely, as ...
The daily dose of 2.5 mg/kg body weight would not cause adverse health effects in the majority of adolescent caffeine consumers. This is a conservative suggestion since older and heavier-weight adolescents may be able to consume adult doses of caffeine without experiencing adverse effects. [72]
But according to Yawitz, “having too much can lead to anxiety, insomnia, diarrhea, jitters, a rapid heart rate, and other unpleasant side effects.” And, in very extreme cases, death. Mike Kemp ...
Research indicates that caffeine, ingested either by drinking coffee or by taking a caffeine supplement, can help improve memory, explains Brynna Connor, M.D. “There is also evidence that shows ...
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]
Why is too much caffeine bad for your health? If you have too much caffeine in too short a time (such as consuming 1,200 milligrams), you can have seizures and even die, according to the FDA.
The caffeine in tea is a mild diuretic. However, the British Dietetic Association has suggested that tea can be used to supplement normal water consumption, and that "the style of tea and coffee and the amounts we drink in the UK are unlikely to have a negative effect [on hydration]". [22]