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A number of fatalities have been caused by overdoses of readily available powdered caffeine supplements, for which the estimated lethal amount is less than a tablespoon. [13] The lethal dose is lower in individuals whose ability to metabolize caffeine is impaired due to genetics or chronic liver disease. [14]
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.
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 ...
“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 ...
Excessive caffeine from coffee, tea, energy drinks, and other beverages may increase heart rate and raise blood pressure, which may lead to heart disease. ... liver cancer . endometrial cancer. If ...
Caffeine increases intraocular pressure in those with glaucoma but does not appear to affect normal individuals. [ 134 ] The DSM-5 also includes other caffeine-induced disorders consisting of caffeine-induced anxiety disorder, caffeine-induced sleep disorder and unspecified caffeine-related disorders.
For this study, the researchers defined chronic caffeine consumption as drinking any caffeinated beverage—including coffee, tea, soda, and energy drinks—five days a week for over a year.
Caffeine increases intraocular pressure in those with glaucoma but does not appear to affect normal individuals. [119] It may protect people from liver cirrhosis. [120] There is no evidence that coffee stunts a child's growth. [121] Caffeine may increase the effectiveness of some medications including ones used to treat headaches. [122]