The Tea-and-Aging Study Everyone Shared This Month Barely Looked at Oolong
A 2025 tea-and-aging review found tea may guard against several diseases of age, and a ScienceDaily write-up sent it around again this June. Almost all of it rests on green tea, and the authors say plainly that oolong is little studied.
A review of tea and healthy aging that circulated widely this month rests almost entirely on green tea, and its authors state plainly that oolong's effects are little studied by comparison.
The paper, by Mingchuan Yang, Li Zhou, and colleagues at the Tea Research Institute of the Chinese Academy of Agricultural Sciences, appeared in the journal Beverage Plant Research. It gathered the evidence linking tea drinking to lower rates of heart disease, diabetes, some cancers, cognitive decline, and age-related muscle loss. Read the sourcing under those associations and one leaf accounts for most of it. "Despite extensive studies on green tea," the authors write, "there is limited information on the effects of other tea types, such as black, oolong, and white tea, especially concerning their comparative health benefits."
The distinction matters for what follows. Oolong is not green tea: it is partly oxidized, from perhaps 8% to 80% depending on the maker, and often roasted over charcoal after that. Oxidation and roast change the chemistry the health studies measure, the catechins and their oxidation products, in ways no one has yet mapped against green tea in a careful trial. On the evidence the review gathers, oolong has simply not been tested the way green tea has.
The review adds one caution that needs no trial to trust. Sweetened ready-to-drink teas, the authors note, "often contain sugar, artificial sweeteners, and preservatives, which may reduce or negate the health benefits." A bottled oolong falls outside the kind of tea these associations were measured on.
None of this settles whether to drink oolong. What the review shows is narrower than the headlines: when a study says tea guards against the diseases of age, it is, for now, mostly saying green tea. The seventh steep has yet to be measured on its own.
Sources: ScienceDaily, "Tea can improve your health and longevity, but the way you drink it matters" (June 9, 2026); Yang, M. et al., "Beneficial health effects and possible health concerns of tea consumption: a review," Beverage Plant Research, doi:10.48130/bpr-0025-0036.