The Science of Green Tea & Healthy Aging

Green tea has been valued for centuries, and a growing body of scientific research backs up what Japanese households have long known - it's genuinely good for you. Below is a summary of some notable findings, with links to the studies themselves.

Lower risk of death

A large study following over 90,000 people for nearly 19 years found that those drinking five or more cups of green tea daily had a meaningfully lower risk of death from any cause compared to light drinkers. A separate analysis combining 18 studies found a similar pattern.

Study: green tea and all-cause mortality · Meta-analysis: tea consumption and mortality

Brain health & cognitive decline

Large, multi-year studies following thousands of older adults have linked regular green tea drinking to a meaningfully reduced risk of cognitive decline.

Study: green tea and cognitive decline · Study: green tea and brain aging

Heart health

Multiple meta-analyses have found green tea drinkers have a lower risk of dying from heart disease, along with reduced rates of stroke and heart attack.

Review: cardioprotective effects of green tea

Cellular aging (DNA & telomeres)

Telomeres are protective caps on our DNA that shorten with age. Studies have found green tea consumption associated with slower telomere shortening over time.

Study: green tea and telomere length

Metabolism & blood sugar

Green tea has also been studied for its role in healthy blood sugar regulation and body composition.

Review: green tea and blood sugar regulation

---

Note: much of this research involved concentrated green tea extract in clinical settings, rather than a daily cup of leaf tea specifically. Individual results vary, and this page is provided for general interest rather than medical advice.

For a fuller round-up of the research, see: Extensive Research Links Green Tea to Healthy Aging (Renue By Science).