There is some new research, apparently creditable, to the effect that "Green Tea Boosts Production of Detox Enzymes, Rendering Cancerous Chemicals Harmless". I'm quoting the headline from an article on the American Association for Cancer Research's website summarizing it:
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Note that this doesn't necessarily translate into a clinical benefit. I don't care about my enzymes per se, I'm interested in not getting cancer. But we can hope that they are linked.
Also note that subjects weren't fed tea but rather pills containing epigallocatechin gallate (EGCG) "in amounts equal to that found in 8-16" cups of green tea.
Best,
Rick.