Here are some of the most respected and/or recent studies about coffee consumption and whether it’s healthy, based on the web search results:

1. Coffee consumption and health: umbrella review of meta-analyses of multiple health outcomes
This study from 2017 reviewed 201 meta-analyses of observational research and 17 meta-analyses of interventional research on coffee consumption and various health outcomes.
The study found that coffee consumption was more often associated with benefit than harm for a range of health outcomes across exposures including high versus low, any versus none, and one extra cup a day.
The study concluded that coffee consumption seems generally safe within usual levels of intake, with summary estimates indicating largest risk reduction for various health outcomes at three to four cups a day, and more likely to benefit health than harm.
2. Is coffee good or bad for your health?
This article from 2021 summarizes the current evidence on the health benefits of coffee consumption, based on the research of Frank Hu, chair of the Department of Nutrition at Harvard T.H. Chan School of Public Health.
The article states that moderate coffee intake (about 2–5 cups a day) is linked to a lower likelihood of type 2 diabetes, heart disease, liver and endometrial cancers, Parkinson’s disease, and depression. It also suggests that coffee may reduce the risk of early death.
The article notes that some groups should be careful about drinking coffee, such as children, pregnant women, and people with anxiety disorders. It also advises to brew coffee with a paper filter and avoid adding too much cream or sugar.
3. This new study about coffee shows that genes regulate your coffee consumption
This article from 2021 reports on several new studies that have found that drinking coffee, whether caffeinated or decaffeinated, ground or instant, is associated with health benefits, such as increased longevity, lower risk of cardiovascular disease, and reduced mortality.
The article also highlights one study that suggests that genes regulate how much coffee people drink and protect them from consuming too much, especially if they have high blood pressure or heart problems.
The article quotes Marilyn Cornelis, an assistant professor of preventive medicine at Northwestern University Feinberg School of Medicine and one of the authors of the study: “Coffee is protective for some individuals depending on their genetics.”
4. Coffee consumption, health benefits and side effects: a narrative review
This study from 2021 reviewed the literature on the effects of coffee consumption on human health, focusing on its benefits and side effects.
The study found that coffee may contribute to the prevention of inflammatory and oxidative stress-related diseases, such as obesity, metabolic syndrome and type 2 diabetes; coffee consumption seems to be associated with a lower incidence of several types of cancer and with a reduction in the risk of all-cause mortality; and the consumption of up to 400 mg/day (1-4 cups per day) of caffeine is safe.
The study also noted that some side effects of coffee consumption may include insomnia, anxiety, gastrointestinal disturbances, hypertension and arrhythmias.
5. Caffeine consumption and cardiovascular health
This study from 2022 reviewed the evidence on the effects of caffeine consumption on cardiovascular health, including blood pressure, heart rate, endothelial function, arterial stiffness and cardiac arrhythmias.
The study found that moderate caffeine intake (200–300 mg/day) does not increase the risk of cardiovascular disease or mortality in healthy individuals; however, higher doses (>400 mg/day) may have adverse effects on blood pressure, heart rate and cardiac arrhythmias in susceptible individuals.
The study also suggested that genetic factors may influence the response to caffeine intake and that more research is needed to identify optimal levels of caffeine intake for different populations.
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