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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.
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]
Espresso offers a caffeine surge – but be mindful of the digestive side effects, Homesley said. A quick jolt comes from an espresso, as it is a concentrated form of coffee that's brewed with ...
Because of these side effects, people with high blood pressure, gastrointestinal issues, anxiety, or ADHD, and women who experience heart palpitations in menopause might want to avoid highly ...
Conversely, other studies show there are potential adverse effects to regular coffee drinking, such as increased anxiety, a trigger for migraine, sleeping issues, and gastrointestinal issues.
The excreted metabolites are mostly paraxanthines—theobromine and theophylline—and a small amount of unchanged caffeine. Therefore, the metabolism of caffeine depends on the state of this enzymatic system of the liver. [170] Coffee is also known for its laxative effects, inducing defecation in some people within minutes of consumption.
Specifically, coffee drinkers had the lowest risk—nearly 50% reduction in risk—while people who consumed 200 to 300 mg of caffeine from tea or a mix of both beverages were about 40% less ...
Caffeine can cause a physical dependence, if consumed in excessive amounts. [3] The need for caffeine can be identified when individuals feel headaches, fatigue and muscle pain 24 hours after their last energy drink. [4] Some commercially distributed drinks contain guarana, a South American berry with a caffeine content about twice that of ...
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