Coffee is considered a “superfood” for health by researchers worldwide, offering unexpected benefits across multiple body systems.
1. Protects Heart Health
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This is coffee’s most frequently cited health benefit—provided you drink it in moderation, neither too much nor too little, for the best effect.
A study published in PLOS Biology by the IUF–Leibniz Research Institute for Environmental Medicine (Düsseldorf, Germany) “prescribed” four cups of coffee per day to help protect heart cells in people with obesity or prediabetes, and even to help repair certain types of heart muscle damage.
Another study from the University of São Paulo (Brazil) found that three cups per day can help prevent arterial plaque buildup—the key factor behind atherosclerosis, heart attacks, and strokes.
Meanwhile, researchers at the University of South Australia confirmed coffee’s cardiovascular benefits but warned that drinking more than six cups a day could reverse the effect, raising heart disease risk by up to 22%.
2. Supports Kidney Health
Research published in Kidney International Reports shows that people who drink any amount of coffee daily have, on average, a 15% lower risk of developing acute kidney injury (AKI). The protective effect rises to about 22–23% for those who drink two to three cups per day.
To reach this conclusion, scientists at Johns Hopkins University School of Medicine (USA) tracked more than 14,000 people over 24 years. They attribute the protective effect to caffeine and other bioactive compounds in coffee, which improve blood flow and oxygen delivery to the kidneys.
3. Helps Prevent Certain Cancers
A study from China Medical University found that men who drink just one cup of coffee a day reduce their risk of prostate cancer by 9%. Among those already diagnosed, their risk of death was 16% lower than in non-coffee drinkers. This large BMJ analysis examined data from over one million men, including 57,732 with prostate cancer.
In the United States, research from the Dana-Farber Cancer Institute and the Mayo Clinic, published in JAMA Oncology, linked drinking two to three cups of coffee per day to improved survival in patients with colorectal (colon) cancer.
Another observational study by Queen’s University Belfast on more than 365,000 coffee drinkers revealed an even more striking result for hepatocellular carcinoma (HCC), the most common type of liver cancer: regular coffee drinkers had up to a 50% lower risk compared with non-drinkers.
4. Reduces Risk of Depression
Harvard University researchers analyzed data from 300,000 people and found that coffee drinkers were significantly less likely to experience depression than those who don’t drink coffee.
The positive effect on mood also extends to easing everyday stress. For optimal results, at least two cups per day are recommended.
The researchers believe these benefits stem from coffee’s anti-inflammatory and antioxidant compounds, which positively influence beneficial gut microbiota—long known to be closely linked to brain function and mental health.
5. Promotes Fat Loss
A study in The Journal of Nutrition, led by the U.S. Centers for Disease Control and Prevention (CDC), concluded that drinking two to three cups of coffee per day can help reduce excess body fat.
The research drew on data from the U.S. National Health and Nutrition Examination Survey (NHANES), which examined the health profiles, diet, and lifestyle habits of more than 190,000 people. Coffee’s bioactive compounds were identified as key to this fat-reducing effect.
An earlier study from the University of Granada (Spain) also found that consuming about 3 mg of caffeine per kilogram of body weight—roughly equivalent to one strong cup of coffee—30 minutes before exercise significantly increases the rate at which the body burns fat.