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Excessive caffeine from coffee, tea, energy drinks, and other beverages may increase heart rate and raise blood pressure, which may lead to heart disease. ... so the effects of caffeine may vary ...
“However, caffeine also triggers the release of adrenaline, which raises your heart rate and can cause jitteriness or anxiety in some people, especially in large doses,” Dr. Wu continues.
And excessive caffeine can raise your heart rate and blood pressure. She recommends that people with medical conditions such as heart problems, acid reflux, or anxiety disorders limit or avoid coffee.
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).
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.
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]
Chronic, excessive caffeine — above the recommended 400 mg a day — can elevate heart rate, (and) blood pressure, but depending on the form can come with additional drawbacks such as excessive ...
And doctors are widely taught that caffeine can cause these heart disturbances. To check, Marcus and colleagues examined 1,388 people, with an average age of 72, taking part in a larger heart study.