No. Moderate coffee is linked to benefits

Most evidence is observational, so it can't fully prove coffee causes the benefits, but results are consistent across many large studies and randomized trial data show no meaningful harm at moderate intake. Caffeine can cause anxiety, insomnia, reflux or palpitations in sensitive people, and intake should be limited in pregnancy. Some people metabolize caffeine slowly, and some drinks sold as coffee contain large amounts of sugar and fat, which are the more likely sources of harm.

• Large cohort studies and meta-analyses link 3 to 4 cups a day with equal or lower all-cause mortality than no coffee.
• Up to about 400 mg of caffeine a day (roughly 4 cups) is considered acceptable for most healthy adults by the FDA and EFSA.
• Coffee is associated with lower risk of type 2 diabetes, liver cirrhosis and liver cancer.
• Pregnant people are advised to limit caffeine to about 200 mg a day.
• Unfiltered coffee raises LDL cholesterol, and added sugar and cream can add calories.

The overall evidence does not support calling moderate coffee consumption unhealthy. However, 400 mg is a general upper guideline, not a target or a guarantee against symptoms. If coffee disrupts your sleep or causes other symptoms, reducing the amount or choosing decaf is reasonable; certain medical conditions and medications may also require a lower limit. The apparent long-term benefits are largely based on observational research, so they are not a reason to start drinking coffee for health.

• Large research reviews find that usual coffee consumption is more often associated with health benefits than harm.
• For most healthy adults, up to 400 mg of caffeine daily from all sources is generally not associated with negative effects; some people tolerate less.
• A 12-ounce brewed coffee typically contains about 113–247 mg of caffeine, so cup size and strength matter.
• Coffee drinking is associated with lower rates of type 2 diabetes and several liver conditions, but these associations do not prove that coffee prevents them.
• During pregnancy, guidance recommends keeping total caffeine intake below 200 mg per day.

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Extensive epidemiological and clinical research indicates that moderate coffee drinking is not bad for health and may offer modest protective benefits against conditions like heart disease, stroke, and type 2 diabetes. While excessive intake or high sensitivity to caffeine can cause temporary sleep disruption, elevated heart rate, or digestive discomfort, these are reversible dose-related effects rather than long-term harms. Unfiltered coffees (such as French press or Turkish coffee) contain cafestol, which can raise LDL cholesterol, but filtered coffee does not carry this effect.

• Large cohort studies associate moderate coffee drinking (3–4 cups per day) with lower all-cause mortality.
• Regular intake is linked to reduced risks of type 2 diabetes, cardiovascular disease, and Parkinson's disease.
• Health authorities consider up to 400 milligrams of caffeine daily (roughly four 8-ounce brewed cups) safe for non-pregnant adults.
• High doses can trigger insomnia, jitteriness, anxiety, or acid reflux, especially in sensitive individuals.
• Pregnant individuals are generally advised to limit caffeine intake to 200 milligrams per day.

This is a question about meaningful harm at normal exposure, and at normal exposure the evidence is reassuring rather than worrying. Prospective cohort studies following millions of people over decades consistently show that moderate coffee drinkers have mortality and chronic-disease rates similar to or slightly better than non-drinkers, with a J-shaped pattern that turns unfavourable only at very high intakes. The harms that do exist are real but bounded: caffeine-related jitteriness, insomnia and palpitations, raised LDL from unfiltered coffee, and elevated risk in pregnancy above about 200 mg a day. Those are reasons to moderate intake in specific groups, not evidence that coffee is bad for people in general.

• Large reviews of observational studies find moderate coffee drinking (about 3-5 cups a day) associated with lower all-cause mortality and lower risk of type 2 diabetes, Parkinson's disease, and liver disease.
• Common short-term effects — jitteriness, trouble sleeping, palpitations, a small temporary rise in blood pressure — are dose-related and more likely above roughly 400 mg of caffeine a day (about 4 cups) or in people who are sensitive to caffeine.
• For pregnancy, many health bodies advise keeping caffeine to about 200 mg a day; higher intakes are linked to lower birth weight and higher miscarriage risk.
• Unfiltered coffee (French press, boiled, some espresso) contains diterpenes that can raise LDL cholesterol; paper-filtered coffee removes most of them.
• Serious harm is mostly a matter of very large doses: caffeine toxicity generally appears well above 1 gram in a single sitting, and the lethal range is far higher.

The worldwide scientific consensus, supported by large-scale meta-analyses and reviews from organizations like the American Heart Association and the World Health Organization, is that moderate coffee consumption is generally safe and more likely to be beneficial than harmful for most adults. Studies consistently show that drinking 3 to 5 cups of coffee per day is associated with a reduced risk of several chronic diseases, including type 2 diabetes, cardiovascular disease, stroke, and certain cancers. However, some groups—such as pregnant women, individuals with anxiety disorders, or those at risk for bone fractures—may need to limit or avoid coffee due to potential risks. While coffee can cause temporary side effects like increased blood pressure or digestive discomfort, these do not outweigh the overall health benefits for the general population.

• Moderate coffee intake (3–5 cups/day) is associated with a reduced risk of all-cause mortality and cardiovascular disease.
• Coffee consumption is linked to lower risks of type 2 diabetes, stroke, Parkinson’s disease, and liver cancer.
• The American Heart Association states that up to 5 cups of coffee per day is safe for most adults and may benefit heart health.
• Pregnant women and those with anxiety disorders or bone health concerns may need to limit coffee intake.
• Coffee can cause temporary increases in blood pressure and may trigger anxiety or digestive issues in some individuals.

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