Drinking 3–4 Cups of Coffee or Tea Lowers Diabetes Risk

If you’re trying to lower your risk of developing type 2 diabetes, the answer might already be in your kitchen cupboard. New research provides clear evidence that regular consumption of coffee and tea—whether they contain caffeine or not—can significantly reduce your chances of getting the disease.

The quick answer? Drinking 3 to 4 cups of coffee or tea per day—regular or decaf—lowers your risk of type 2 diabetes by 25% compared to those who drink little or none. Each additional cup reduces risk by another 7%.

What the Research Found

Australia’s University of Sydney research team, led by the Huxley group, analyzed data from 18 separate studies involving over 450,000 participants. Their findings, published in the Archives of Internal Medicine, showed a consistent pattern: the more coffee or tea people drank, the lower their risk of developing type 2 diabetes.

Specifically, each extra cup of coffee consumed per day was linked to a 7% reduction in diabetes risk. People who drank 3–4 cups daily had a 25% lower risk than those who drank little or none. This protective effect held true even for decaffeinated versions of both beverages.

Why the Link Exists—But Isn’t Fully Understood

Despite the strong statistical trend, researchers couldn’t fully explain why coffee and tea have this protective effect. The studies reviewed didn’t provide enough data on how these drinks—or their chemical components—affect blood sugar levels or insulin sensitivity.

The report stated: “Because most included studies did not offer data on the impact of these beverages or their ingredients on hyperglycemia and insulin sensitivity, we could not provide further evidence on the mechanism reducing diabetes risk.”

In other words, while the numbers are clear, the biological reasons remain partly speculative.

Caffeine Isn’t the Only Factor

Interestingly, the protective effect doesn’t seem to come solely from caffeine. The researchers noted: “Our findings suggest that the protective effect of coffee and tea is unlikely to be solely due to caffeine. It’s probable that various chemical compounds in tea and coffee are responsible.”

This hints that other bioactive substances—possibly antioxidants or polyphenols—may play a key role in reducing diabetes risk, regardless of caffeine content.

Global Implications

The findings are especially significant given the rising global prevalence of type 2 diabetes. The International Diabetes Federation projects that by 2025, 380 million people worldwide will have the condition, largely driven by poor diet and lack of physical activity.

If drinking a few extra cups of coffee or tea can help curb that trend—even slightly—it could have meaningful public health benefits.

Frequently Asked Questions

How many cups of coffee or tea reduce diabetes risk?

Drinking 3 to 4 cups of coffee or tea per day—whether caffeinated or decaffeinated—can lower your risk of type 2 diabetes by 25% compared to drinking little or none. Each additional cup is linked to a further 7% risk reduction.

Does decaffeinated coffee or tea also help?

Yes. The study found that decaffeinated coffee and tea also contribute to a reduced risk of type 2 diabetes, meaning caffeine isn’t the only protective component.

What causes the reduced diabetes risk?

The exact cause isn’t known, but researchers believe it’s not just caffeine. Other chemical compounds in coffee and tea—possibly antioxidants or polyphenols—are likely contributing to the protective effect.

Why don’t we know the exact mechanism?

Most of the studies reviewed didn’t measure how coffee or tea affects blood sugar or insulin sensitivity directly. Without that data, researchers couldn’t confirm the precise biological process behind the risk reduction.

Is this relevant to people already at risk of diabetes?

While the study focuses on general risk reduction, the findings suggest that increasing coffee or tea intake could be a simple lifestyle adjustment that may help lower diabetes risk, especially for those with poor dietary habits or low physical activity.

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