Keith DesRochers, MD
Clinical Insights
Longevity
Nutrition
Green tea and cancer prevention—more than a ritual
Green tea has always had a wellness halo. But modern research is beginning to show that its benefits may go beyond ritual, focus, and a gentler caffeine lift. Scientists are studying EGCG, one of green tea’s key compounds, for its potential role in cancer prevention, including how it may influence inflammation and interfere with the pathways cancer cells use to grow. Your morning cup may be doing more than you think.
Green tea is one of those habits that feels almost too simple to matter. It has been consumed for thousands of years, valued for its gentle lift, its ritual significance, and its place in daily life across many cultures.
But over the last few decades, researchers have begun asking a more pointed question: could green tea do more than comfort and energize us? Could it help protect against disease?
The answer is still evolving, but the evidence is becoming harder to ignore.
Back in 2007, researchers from Rutgers presented findings at the 6th Annual International Conference on Frontiers in Cancer Prevention Research showing that rats fed the human equivalent of four to six cups of green tea per day were 55% less likely to develop colon cancer. Among the rats that did develop cancer, their tumors were 45% smaller than those in the control group.
Of course, animal studies are not the same as human outcomes. And like many nutrition studies, the research on green tea has not been perfectly consistent. But the number of studies showing promise is significant, with potential benefits being explored across a range of conditions, including prostate cancer, breast cancer, pancreatic cancer, heart disease, and memory.
More recently, the evidence has moved closer to human health. A 2025 systematic review and meta-analysis screened 2,334 papers and ultimately included 43 studies: 7 randomized controlled trials and 36 cohort studies. The findings suggested that both green tea and EGCG, its best-known active compound, may reduce cancer risk compared to controls.
The protective effect was especially notable for certain cancers, including prostate, oral, gallbladder, and hematological cancers.
Researchers also looked at whether more green tea meant more benefit. Broadly, the answer appeared to be yes. Higher intake over a longer period of time was associated with a more consistent reduction in cancer risk.
That does not mean green tea is a cancer prevention “hack,” or that everyone should start drinking it by the pot. These findings still need to be validated in more diverse populations and through large, well-designed randomized trials. But they do suggest that green tea may be one of those rare wellness habits where the ritual and the science are beginning to meet.
So what makes green tea so interesting?
Much of the attention centers on EGCG, or epigallocatechin gallate, a plant compound being studied for several possible cancer-protective mechanisms. Scientists believe EGCG may act on multiple pathways at once, including antioxidant activity, inflammation suppression, gene regulation, and disruption of the signaling pathways cancer cells use to grow.
In other words, green tea may not work through one dramatic mechanism. It may work more quietly, by supporting the body across several biological systems at the same time.
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A note from Dr. Keith
Not everything that becomes trendy deserves the attention it gets. But green tea has earned it.
The science is genuine, the potential upside is meaningful, and the risks are quite low. For most people, the main thing worth monitoring is caffeine intake.
It is one of the simplest, most accessible habits you can add to your daily routine.
Given that green tea is safe for most people and likely has a range of health benefits, the next time you are reaching for something to drink, consider making it green tea.