Tea consumption linked to health benefits, but preparation method matters
A review published in Beverage Plant Research by researchers at the Chinese Academy of Agricultural Sciences confirms that tea — especially green tea — is associated with reduced risks of cardiovascular disease, diabetes, obesity, and certain cancers. The study draws on both experimental and human cohort data, highlighting tea's polyphenolic compounds, particularly catechins, as the primary drivers of its health benefits. However, the review warns that bottled and bubble teas containing added sugars, artificial sweeteners, and preservatives may undermine or negate those benefits.
Researchers from the Tea Research Institute at the Chinese Academy of Agricultural Sciences conducted a comprehensive review of tea's health effects, finding strong evidence that regular consumption of traditionally brewed tea — particularly green tea — can lower blood pressure, improve cholesterol levels, reduce all-cause mortality, and decrease the risk of cardiovascular disease and certain cancers. Tea's catechins and other polyphenols are identified as the key bioactive compounds responsible for these effects. The review also highlights emerging evidence for tea's neuroprotective properties, including a reduced prevalence of cognitive decline and Alzheimer's disease biomarkers in older adults, as well as its potential to preserve muscle mass and physical performance in seniors. On the risk side, the authors flag commercial tea products such as bottled and bubble teas, which often contain added sugars, artificial sweeteners, and preservatives that can reduce or negate health benefits. Additional concerns include pesticide residues, heavy metals, and microplastics detected in some tea products, though the review notes these do not pose significant health risks at typical consumption levels. Tea may also interfere with the absorption of non-heme iron and calcium, a consideration for vegetarians and those with specific nutritional needs. The authors call for further research into the long-term effects of different tea types — black, oolong, and white tea remain understudied compared to green tea — and the cumulative impact of contaminants in heavy tea drinkers.
What's missing
The review does not specify the quantity of tea consumption associated with optimal health benefits (e.g., cups per day), nor does it address whether findings from predominantly Asian study populations generalize to other demographics.
What different sources said
- Science DailyCenter
Tea can improve your health and longevity, but the way you drink it matters
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