Figure 4 shows the foods and you can download the data from there as well for your own analysis.
Your question is still a good one, but hoping the above context makes the "so tea as a blanket category just... works?" less absurd.
Turns out the “fermenting” of tea is mostly self contained. Autolysis, I think might be the word?
If you recall that caffeine is an insecticide this makes sense. The caffeine is stored as a time bomb waiting for some insect to chew. Mastication mixes the caffeine crystals and the enzymes already present in the leaf, which then render it soluble and bang, dead insect. To process tea you just need to activate the enzymes the right amount at the right temperatures, and then dry the leaves before they can rot.
If you get a proper oolong loose leaf, and let it steep long enough, you will find what looks like whole leaves in your cup. Not unlike those little dinosaur sponges they sell to kids. Just add water.
Even one in Sweden -
It takes about 3-5 years to first harvest though
The newest diet fad has not been around nearly long enough to even begin to determine its effect on longevity.
This figure literally talks to me: "You should drink more tea!"