Many of the other blue zones are heavy on the seafood, but on the flip side there are problems with seafood that have nothing to do with the actual fish themselves and everything to do with chemicals and the way we're trashing out planet.
I like a plant-based diet myself and have been on and off them over life, but the one habit that seems to keep me healthier than others is avoiding bread, pasta, and cheese.
Edit: it's also statistical, not everyone is going to be healthier.
I eat meat too, though. Almost entirely chicken and fish. It would be really hard otherwise, though I do like tofu and a lot of meat substitutes.