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There have been 3 recent umbrella reviews published on the health effects of tea [1], [2], [3]. However, they are not really telling us anything new other than what is already cited on the Wikipedia article so I just leave them here for now. Based on what I have seen there are few clinical trials on this topic, most of the data is coming from observational studies. Psychologist Guy (talk) 19:05, 10 November 2021 (UTC)[reply]
China study: tea drinking delays biological ageing
I'm not an expert, so don't know what to make of it.