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Studies of populations suggest that drinking a moderate amount of coffee may reduce the risk of cardiovascular disease, including certain arrythmias (such as atrial fibrillation), stroke, and death from heart attack and other causes.

However, the news is not all good. Among people with very high blood pressure, even modest amounts of coffee may increase the risk of cardiovascular disease, such as heart attack. In addition, certain types of coffee may increase levels of cholesterol and are associated with an increased risk of dementia. There is also concern about pesticides in coffee, whether coffee can worsen symptoms of burning mouth syndrome or increase the risk of brain bleeds, and intake of large amounts of coffee during pregnancy.

A small clinical trial among healthy adults has also investigated the effects of caffeinated coffee on the occurrence of premature atrial contractions (PACs) and premature ventricular contractions (PACs), -- sometimes referred to as “heart palpitations,” as well as its effects on activity levels, blood sugar levels, and sleep.

Sign in as a member to learn more about the health effects of coffee and instant coffee, including whether adding milk, milk alternatives, or collagen lessens heart benefits of coffee. Also, find out how much caffeine is in regular and decaf coffee, how "fermented coffee" and "cold brew" coffee differ from traditional coffee, and whether drinking "low-acid" coffee, such as Fabula or Puroast, are beneficial for people with acid reflux or gastroesophageal reflux disease (GERD). Also find out if drinking coffee prepared with aluminum capsules or bleached filter paper can expose a person to harmful chemicals (and if rinsing the filter before brewing coffee can reduce exposure), and if brewing coffee that comes in plastic capsules causes plasticizers (such as BPA or phthalates) to leach into coffee.

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