The (often human) meat eating master races always had an edge to conquer the carb eating slave races, whether the Akkadians or the Germans, the Aztec or the Indo-Aryans. Meanwhile, the carb eat people could multiply in much greater numbers. The Diet-Historical complex.
I have discussed the Arithmetics of Anthropophagy in the past https://fare.livejournal.com/135967.html Believe the cliché that medieval Nobility (the German Master Race of a (Frank)Reich of over a Thousand Year) was indeed stronger, healthier and better looking than the common rabble below them.