Post-Plague diets were much improved from pre-Plague diets, and regional variation (especially in areas where pastoralism is strong, like northeastern Spain) was present, but the article also uses later livestock yields for estimating Barcelona's consumption when livestock of the period were only 50%-75% as heavy before the advent of modern breeding and the four-field system in the 18th century.

I'm actually very interested to read about the households of the Earls of Stafford and Warwick, though, that sent me down a rabbit hole of Renaissance/Late Medieval diet that I suspect I will very much enjoy.