Pastoralist populations are adapted to diets consisting of mostly dairy & meat, and it's one factor that was an advantage over other populaces. The grain-based diet from the middle East/ South Europe is not ideal for us, but it does apparently increase fertility. People who deny race, also tend to believe that all humans have the exact same dietary needs & reactions, which is just ignorant. So I assume that there are Equality Devotees who attack the notion of dietary differences between racial groups, just like there are ones that want "dog breed equality".