> I do eat pretty much like the Okinawans -- plenty of seafood and pork,
fresh
> green veggies, and tofu

Seafood is another story indeed. You never know whether your fish was at
Minamata bay before to take on loads of mercury, or in some harbor while
getting polluted with other chemicals. Then there the Vietnamese pigs
suffering of avian flu.
But as long as you live on nigauri (goya), you are probably safe.
And there is the very fresh sashimi which might get you something of the
tapeworm species...