Drinking 3–4 Cups of Coffee Daily May Lower Death Risk

You’ve probably heard conflicting reports about whether your daily coffee habit helps—or harms—your health. But what if drinking a few cups a day could actually lower your chances of dying early from common killers like heart disease or stroke? A major long-term study out of Japan offers some clear numbers on just how much coffee might contribute to a longer life.

If you drink around 3 to 4 cups of coffee per day, research shows your risk of dying from cardiovascular or respiratory diseases could drop by roughly 40%. Overall, your risk of death from any cause may fall by about 24% compared to those who rarely or never drink coffee.

What the Japanese Study Found

Conducted by a joint team from Japan’s National Cancer Center and the University of Tokyo, the study tracked nearly 90,000 people aged 40 to 69 living in ten prefectures. Researchers began collecting data in the 1990s and followed participants until the end of 2011, examining how their coffee consumption related to causes of death common in Japan.

The results showed a clear pattern: the more coffee people drank (up to a point), the lower their risk of dying from several major conditions. People who reported drinking 3 to 4 cups daily had significantly reduced risks compared to those who drank little or no coffee.

How Different Coffee Amounts Affected Death Risk

Here’s a breakdown of the specific findings based on daily coffee intake:

• 3–4 cups per day: Risk of death from heart disease dropped 36%; from stroke, 43%; and from respiratory diseases like pneumonia, 40%.
• 1–2 cups per day: Benefits were present but less pronounced.
• 5 or more cups per day: Insufficient data to draw firm conclusions.

Interestingly, when looking at all causes of death combined, those drinking 3–4 cups daily saw an overall risk reduction of approximately 24%.

What About Green Tea?

The same study also looked at green tea consumption. It found that men who drank 5 or more cups of green tea daily had a 24% lower risk of dying from stroke and a 45% lower risk of respiratory disease death. Women drinking similar amounts had a 37% reduced risk of dying from heart disease. But the strongest and most consistent benefits across multiple causes were seen with moderate coffee intake.

Why Might Coffee Lower Death Risk?

Researchers pointed to specific compounds in coffee that may offer protective effects. Chlorogenic acids, a type of antioxidant found abundantly in coffee, are believed to help regulate blood sugar and blood pressure. Caffeine, meanwhile, may contribute to better vascular health. Together, these components may explain the reduced risks for heart-related and respiratory diseases.

It’s worth noting that the study did not examine the effects of adding sugar or milk to coffee—just the impact of coffee drinking itself. Also, the research did not explore cancer mortality.

Frequently Asked Questions

How many cups of coffee a day were linked to lower death risk in the Japanese study?

Drinking 3 to 4 cups of coffee per day was associated with a roughly 40% lower risk of death from cardiovascular and respiratory diseases, and about a 24% lower risk of death from all causes combined, compared to drinking little or no coffee.

Did the study find any benefits from drinking more than 5 cups of coffee a day?

No. The study did not have enough data on people drinking 5 or more cups daily to draw reliable conclusions about their risk levels.

What kinds of diseases showed the biggest risk reductions with coffee drinking?

The greatest reductions were seen in deaths from heart disease (36%), stroke (43%), and respiratory diseases such as pneumonia (40%) among those who drank 3 to 4 cups of coffee per day.

Did the study look at how coffee is prepared or whether it includes milk or sugar?

No. The research focused solely on the quantity of coffee consumed and did not differentiate between black coffee, coffee with milk, or sweetened coffee.

Were there any benefits from drinking green tea in the same study?

Yes. Drinking 5 or more cups of green tea per day was linked to a 24% lower risk of stroke death and 45% lower risk of respiratory death in men, and a 37% lower risk of heart disease death in women. But coffee showed more consistent benefits across more causes.

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