Barbarians having better (or at least more) sources of proteins seems to be a recurring theme. The Huns and Mongols probably ate more meat than the average farmer from the lands they conquered on their path.

I wonder if this isn't similar to the recent push to substitute meat with these fake meats, which are nothing but highly processed vegetable oils, some shady vegetable proteins and lots of flavouring, all mixed together, and the same to all those "milks", from soy to almonds.