Imagine being an Inuit along the arctic coast of the Alaska, Canada or Greenland. There are no bugs (except mosquitos), tofu or soy. But there are a lot of fish.
They seem to have survived quite a long time eating seafood.
The Japanese eat a lot of fish, including smoked fish, and seafood in general, and have more stomach cancer. They smoke a lot of tobacco too, though.
Inuit eat higher fat diet with that fish and blubber and have less heart disease, but higher stroke rates.
For the Inuits, "seafood" includes walrus and seal.