Coffee is one of the world’s most popular drinks—but not everyone knows about its powerful health benefits.
Coffee and Lower Risk of Type 2 Diabetes
Researchers at Harokopio University in Greece conducted a 10-year follow-up study to examine the relationship between coffee consumption and diabetes. They tracked 1,514 men aged 18–87 and 1,528 women aged 18–89 who were free of diabetes at the start.
Participants were divided into three groups:
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No coffee
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Less than 250 ml per day
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More than 250 ml per day
Over the 10 years, 191 participants developed type 2 diabetes. The researchers found that people who drank more than 250 ml of coffee daily had a 54% lower risk of developing type 2 diabetes compared to non-coffee drinkers.
Lead author Efi Koloverou, a clinical nutrition specialist, believes the benefit comes not only from caffeine but also from coffee’s anti-inflammatory compounds, which help reduce the risk of type 2 diabetes.
However, these anti-inflammatory and anti-diabetic effects are linked only to black coffee without added sweeteners such as sugar, condensed milk, or cream. Sugary additives and saturated fats can trigger inflammation and raise blood sugar levels, which is harmful for people with diabetes.
Another large study of 150,000 participants published in May 2023 confirmed that coffee’s antioxidant and anti-inflammatory properties contribute to lowering diabetes risk. Drinking one extra cup of coffee per day could reduce the risk of type 2 diabetes by 4–6%. Doctors, however, recommend no more than 2 cups per day (up to 400 mg of caffeine). Adding artificial sweeteners or cream may increase the risk of heart disease in people with diabetes.
Coffee and Liver Health
A study published in BMC Public Health found that drinking about three cups of coffee per day may significantly reduce the risk of liver cancer and other liver diseases. Researchers analyzed coffee habits of over 494,000 people in the UK Biobank and followed their liver health for more than 11 years.
Participants aged 40–69 included 384,818 coffee drinkers and 109,767 non-coffee drinkers. Results showed that those who drank ground coffee (with or without caffeine) received the greatest liver benefits, while instant coffee drinkers saw less effect.
Compared with non-coffee drinkers, coffee drinkers had:
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21% lower risk of chronic liver disease
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20% lower risk of fatty liver disease
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49% lower risk of death from chronic liver disease
Another analysis by researchers at the University of Southampton and University of Edinburgh, reviewing data from 26 studies involving more than 2.25 million participants, found that compared with non-coffee drinkers, the risk of hepatocellular carcinoma (liver cancer) was 20% lower for those who drank 1 cup per day and 35% lower for those who drank 2 cups per day.
When the body metabolizes caffeine, it produces paraxanthine, a compound that slows the development of scar tissue (fibrosis). This helps improve conditions such as liver scarring, cirrhosis, and non-alcoholic fatty liver disease. In addition, acids in coffee may help combat the hepatitis B virus.
“Improving liver health is not only about drinking coffee,” said Vanessa Hebditch of the UK’s Liver Trust. “It’s also essential to reduce alcohol intake, maintain a healthy weight through regular exercise, and eat a balanced diet.”
Takeaway: Moderate coffee consumption—around 2–3 cups per day—can play a powerful role in reducing the risk of type 2 diabetes, chronic liver disease, and liver cancer, especially when paired with an overall healthy lifestyle.