Cup of black coffee
Close-up of a Cup of black coffee and coffee beans on a dark background. Top view. Flat lay
What Science Says About the Benefits of Drinking It in Moderation
I love coffee. The aroma in the morning, the warmth of the cup in my hands, and that quiet time between me and my coffee before the day begins. Like many people, coffee has long been part of my daily routine and often feels like a soothing ritual throughout the day. But as someone who studies nutrition and preventive health, I recently decided to take a deeper look at what scientific research says about coffee and its effects on the body.
The good news is that a growing body of research suggests that moderate coffee consumption can be part of a healthy lifestyle. Large population studies have linked regular coffee intake with a lower risk of several chronic conditions. A well-known study published in The New England Journal of Medicine, which followed more than 400,000 adults, found that individuals who drank coffee regularly had a lower risk of death overall compared with non-coffee drinkers.¹ Other research has reported associations between coffee consumption and a reduced risk of cardiovascular disease, type 2 diabetes, and certain neurodegenerative conditions, including Parkinson’s disease.²
While these studies show strong associations, researchers emphasize that observational studies cannot prove that coffee directly causes these benefits. Still, the consistency of findings across multiple studies has generated significant scientific interest.
Scientists believe some of these potential benefits may be related to the many bioactive compounds found in coffee, including antioxidants and polyphenols that may help reduce inflammation and oxidative stress in the body. ³
Another reason many people enjoy coffee. especially in the morning, is its effect on metabolism. Caffeine, one of the main active compounds in coffee, stimulates the central nervous system and can temporarily increase metabolic rate. Research suggests that caffeine may increase energy expenditure and promote fat oxidation, meaning the body may burn more fat for energy. Some studies estimate that caffeine can raise metabolic rate by 3 to 11 percent, depending on the individual.⁴ In addition, caffeine stimulates the release of epinephrine, also known as adrenaline, which signals the body to break down stored fat and release fatty acids into the bloodstream to be used as fuel. ⁵
This metabolic effect is one reason some people choose to drink black coffee while fasting, particularly during intermittent fasting routines. Plain coffee contains virtually no calories, so it generally does not significantly disrupt the metabolic state of fasting. Caffeine may also help increase alertness, temporarily reduce appetite, and support the body’s shift toward fat utilization during periods without food.⁶ However, adding sugar, milk, or cream introduces calories that can interrupt this fasting response and reduce some of the metabolic benefits.
It is also important to understand that not all coffee is created equal. The way coffee is prepared can influence its potential health effects. Unfiltered coffee, such as boiled coffee, French press, Greek, or Turkish coffee contains higher levels of natural compounds called cafestol and kahweol, which can raise LDL cholesterol levels when consumed in large amounts.⁷
By contrast, filtered coffee prepared through a paper filter, such as traditional drip coffee, removes most of these compounds. Research published in the European Journal of Preventive Cardiology suggests that filtered coffee may be associated with lower cardiovascular risk compared with unfiltered brewing methods.⁸
Another important factor to consider is what we add to coffee, since certain ingredients can diminish its potential health benefits. Many modern coffee drinks contain flavored syrups, whipped cream, and large amounts of sugar, turning what could be a simple beverage into a high-calorie treat. Excess added sugar can lead to rapid increases in blood glucose and insulin levels, particularly when consumed in liquid form. Over time, frequent insulin spikes may contribute to insulin resistance, a metabolic condition associated with obesity, type 2 diabetes, and increased cardiovascular risk. Diets high in added sugars have also been linked to higher triglycerides, elevated blood pressure, and inflammation, all of which can place additional strain on the heart.⁹¹⁰
After reviewing the research, my conclusion is simple: coffee itself is not the problem—what we add to it often is.
For most healthy adults, enjoying three to four cups of plain, filtered coffee per day appears to be safe and may fit within a healthy lifestyle. As with many things in nutrition and lifestyle medicine, the key is moderation and quality.
So yes, I still love my coffee. But now I appreciate it even more, knowing that when enjoyed thoughtfully and in moderation, that daily cup can be both comforting and supportive of long-term health.
Disclaimer:
This article is intended for informational and educational purposes only and should not be considered medical advice. The research referenced reflects findings from large population studies and scientific literature; however, many of these studies are observational and show associations rather than direct cause-and-effect relationships. Individual responses to coffee and caffeine can vary depending on genetics, health status, medications, and overall lifestyle. Readers should consult a qualified healthcare professional regarding personal health conditions or dietary decisions before making significant changes to their caffeine intake.
References
- Freedman ND et al. “Association of Coffee Drinking with Total and Cause-Specific Mortality.” New England Journal of Medicine. 2012.
- Ding M et al. “Long-Term Coffee Consumption and Risk of Cardiovascular Disease.” Circulation. 2014.
- Grosso G et al. “Coffee, Caffeine, and Health Outcomes.” Annual Review of Nutrition. 2017.
- Astrup A et al. “Caffeine: a double-blind, placebo-controlled study of its thermogenic and metabolic effects.” American Journal of Clinical Nutrition. 1990.
- Dulloo AG et al. “Interactions between caffeine and sympathetic activation in thermogenesis.” International Journal of Obesity. 1999.
- Higdon JV, Frei B. “Coffee and health: a review of recent human research.” Critical Reviews in Food Science and Nutrition. 2006.
- Urgert R., Katan MB. “The cholesterol-raising factor from coffee beans.” Annual Review of Nutrition. 1997.
- Tverdal A. et al. “Coffee consumption and mortality from cardiovascular disease.” European Journal of Preventive Cardiology. 2020.
- Malik VS et al. “Sugar-Sweetened Beverages and Risk of Metabolic Syndrome and Type 2 Diabetes.” Diabetes Care. 2010.
- Yang Q et al. “Added Sugar Intake and Cardiovascular Diseases Mortality Among US Adults.” JAMA Internal Medicine. 2014.
