I'm too tired for the full rant -- but the original so-called "Mediterranean diet" that was vaunted for its health benefits back in the late 1980s early 90s was in fact the diet of the French South-West.
And that is not tuna/fish, olives, lean meat (calf/lamb/sheep), olive oil, vegetables, etc ; but it is fatty meats stewed with various veg in season (beef, pork, rabbit, lamb, etc etc), sausages, pâtés, ham, other charcuteries, cheeses, yes lashings of olive oil, fish and poultry, conserves and pickles, and all manner of the heaviest French foodstuffs ; with little bread, and then wine with it and so on.
As to the fish, it's more likely to be cod, sardines, trout, mackerel, shellfish, crabs, and so on, rather than the more "noble" species like salmon or tuna. And even then, in any significant quantity only near the water.
Wrong region for olives, they have vineyards instead. Figs and other fruit trees though ...
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Still, I am very glad to hear that your diet is treating you so well !!