Best data is still Mediterranean- nuts, fruits vegetables, olive or avocado oil, and lean protein.
I would be willing to bet that things like the siesta, large amounts of sunlight exposure, a more laid back culture, and lots of vacation days are much more important parts of what keeps people living around the Mediterranean healthier - much more so than the actual diet.
Diets high in saturated fat are correlated with high standard of living. High standard of living is correlated with high consumption of processed foods. So... yeah.
The Mediterranean diet is like a Californian wellness type of person's idea of what the actual Mediterranean diet is.
The vegetarian aisle used to be healthier but now it's been invaded by ultraprocessed food too.
I find a meat heavy diet works with keeping weight off. The opposite of what we've been told.