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Anecdotal data - as a Sardinia native, we do eat seafood, but to be honest around me at least that's at most a once a week practice. My grandpas, which lived to 96, 98 and 101, didn't eat much fish either. Lots of veggies though. One of my grandfathers died young due to a heart condition. All of them were regularly checking their health and doing regular blood tests. I can confirm we don't see getting tested as being…
Interesting! Some Friends from Sardinia told me that seafood is predominant in their diet! And of course, veggies.
When I was in Athens, a kilogram of fresh caught sardines ran about 2 euro for a kilo. Thats cheaper than canned!
On Crete, it was a bit more expensive at 4 euro per kilo but I never paid more than 4 euro for a pound of fish. thats cheap enough to make fresh caught fish a daily meal