Here in Norway McDonalds advertises that it only uses Norwegian beef in their burgers: https://www.mcdonalds.com/no/nb-no/maten-vaar/raavarer-og-le...

"Mesteparten av råvarene våre stammer fra norske bønder.

Vi bruker for eksempel kun 100% norsk storfekjøtt, kun norske økologiske egg og norske poteter – og når sesongen tillater det, bruker vi norsk salat, tomat og løk. Vi vet at kundene våre ønsker norske råvarer, og derfor er vi helt og holdent avhengige av norske bønder. Ingen bonde – ingen burger. Kanskje er det din nabobonde som har levert råvarene til akkurat ditt McDonald's-måltid?"

Translated by Google because I am too lazy to type my own translation:

"Most of our raw materials come from Norwegian farmers.

For example, we use only 100% Norwegian beef, only Norwegian organic eggs and Norwegian potatoes - and when the season allows, we use Norwegian salad, tomato and onion. We know that our customers want Norwegian raw materials, and therefore we are completely dependent on Norwegian farmers. No farmer - no burger. Maybe it's your neighbor's farmer who delivered the ingredients for your McDonald's meal?"

As an aside, and because we are talking about yeast, McDonald's burger buns are not really dough based risen bread. It's baked foam. Like they squirt it out all foamy and then bake it. (It's possible that no yeast is used, but I'm not sure)

Yeast is used, and the process isn't any different than supermarket white buns.

Industrial white bread processes do tend to involve very high speed/power mixing that incorporates more air and leads to a smaller crumb structure than traditional bread, but it's certainly not squirted out as a foam.

At 3am, the only trash food which is open is McDonalds and 711 throughout South East Asia, Australia, Europe. Been there, I've seen things.

I think you should expect a little more diversity at 3am. For example, the FEBO in the Netherlands.