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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.
A 2018 study showed that caffeine has a positive result on time trial endurance performance for athletes. “The best way to maximize this boost is to couple your cup of coffee with a snack or ...
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]
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.
Individuals may have genetic differences that could affect their ability to metabolize caffeine, Routhenstein noted, which means coffee’s effects on heart rate and blood pressure can vary from ...
Caffeine dependence can cause a host of physiological effects if caffeine consumption is not maintained. Commonly known caffeine withdrawal symptoms include headaches, fatigue, loss of focus, lack of motivation, mood swings, nausea, insomnia, dizziness, cardiac issues, hypertension, anxiety, and backache and joint pain; these can range in severity from mild to severe. [18]
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 ...
In espresso, however, likely due to its higher amount of suspended solids, there are significant contents of magnesium, the B vitamins, niacin and riboflavin, and 212 mg of caffeine per 100 grams of grounds. [167] One psychoactive chemical in coffee is caffeine, an adenosine receptor antagonist that is known for its stimulant effects. [168]