>My final (and favorite) observation is that developers in Paris take the longest and most consistent lunch breaks. Well, if I lived in Paris, I would too.

A contributing factor might be that a lot of French companies include meal vouchers in their benefits. Generally employees are given the choice to deduce some amount from their payroll and get nearly double that amount in meal vouchers, because the vouchers are government-supported including a tax concession. You can use these at most restaurants in Paris.

You can, of course, use the vouchers to grab a sandwich anywhere and eat it in front of your code, but overall it encourages actual restaurant breaks, since you basically have more money specifically to spend on your lunch.