Seed oil folks often bring up the French paradox, the (controversial) claim that French people are/were thin and have low cardiovascular disease despite eating lots of saturated-fat-rich croissants or whatever.
As a French person hearing about this for the first time, that claim indeed seems pretty odd.
If I was asked to list the lifestyle differences between France and the US with the most impact on public health, I would think of lower car dependency, higher access to farmer’s markets, stricter regulations on industrial food processing (especially sugar content in sodas), smaller portions served in restaurants, pharmacies not doubling as junk food shops, the absence of food deserts, public health messaging (eg every junk food ad having a “please don’t eat this, kids” type disclaimer) etc… way before I thought of the two croissants a week I eat.
Viennoiseries are an occasional food for most people, not a staple. Now if you wanted to examine a french-specific high-carb staple, baguettes are a pretty good options: almost all middle-class households buy one a day at least.
Or maybe speaking french automatically makes you healthier. I’m gonna choose to believe it’s that one.