Green Tea and Coffee May Lower Stroke Risk

Every year, millions of people worldwide suffer strokes — some fatal, many life-altering. While genes and age play a role, lifestyle factors like diet can make a measurable difference. A long-term Japanese study offers clear evidence: two common beverages may help protect your brain.

If you're looking for a simple, science-backed way to lower your stroke risk, consider this: drinking green tea and coffee daily could cut your chances by up to 20%, based on 13 years of data from over 80,000 people.

The Japanese Long-Term Study on Stroke and Beverages

From the mid-1990s through 2008, researchers from Japan’s National Cancer Center and National Center for Cardiovascular Diseases tracked approximately 82,000 adults aged 45 to 74 living across regions from northeastern Japan to Okinawa. Over the 13-year follow-up period, 3,425 participants were diagnosed with some form of stroke — including cerebral hemorrhage, cerebral infarction, and subarachnoid hemorrhage.

How the Researchers Grouped Participants

At the start, subjects were categorized by their tea and coffee consumption:

• Completely non-drinkers of green tea
• Those who drank green tea 1–2 times per week
• 3–6 times per week
• 1 cup per day
• 2–3 cups per day
• 4 or more cups per day

The same approach was used for coffee consumption. These groupings allowed researchers to compare stroke incidence across different levels of intake.

Key Findings: Lower Stroke Risk with Daily Intake

Compared to those who didn’t drink green tea at all, people who consumed at least 1 cup daily saw their risk of cerebral hemorrhage drop by 22% to 35%. When looking at all types of stroke combined, those who drank 2–3 cups of green tea per day reduced their overall stroke risk by 14% to 20%. Similar protective effects were observed with regular coffee consumption.

The researchers noted that green tea contains compounds that support vascular health, while coffee may help improve blood sugar regulation — both factors contributing to reduced stroke likelihood.

Frequently Asked Questions

How much green tea do I need to drink to see a benefit?

Drinking at least 1 cup of green tea per day was linked to a 22–35% lower risk of cerebral hemorrhage. Drinking 2–3 cups per day was associated with a 14–20% reduction in overall stroke risk.

Does coffee also reduce stroke risk?

Yes. The study found that regular coffee drinkers — particularly those having 2–3 cups or more per day — had a lower overall stroke risk compared to non-coffee drinkers, though specific percentages for coffee alone were not detailed in this summary.

What types of stroke were included in the study?

The research covered cerebral hemorrhage (brain bleeding), cerebral infarction (ischemic stroke), and subarachnoid hemorrhage (bleeding in the brain’s outer membrane), all grouped under the general term “stroke.”

Why might green tea and coffee help prevent stroke?

Green tea is thought to protect blood vessels, while coffee may improve blood sugar control. Both factors are believed to contribute to a lower likelihood of stroke.

Is there a maximum safe amount of green tea or coffee to drink?

The study showed benefits for up to 4 or more cups of green tea per day and regular coffee intake, but did not test excessive consumption. Balance and individual tolerance should always be considered.

Recommended FrontStreet Beans for Brain Health

Pair your stroke-prevention routine with FrontStreet Coffee’s Ethiopia Humbera for bright, juicy complexity or Yirgacheffe for floral and citrus notes — both single origins offer clean, energizing cups without bitterness. For a deeper balance, try the Classic Blend, combining smooth body and mild acidity ideal for daily drinking. These beans are carefully roasted to highlight their natural attributes, supporting a focused and healthy caffeine habit. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.