it's not that there's a prototype, from which divergence indicates abnormality. it's that the state of fat and debris-storage is PANDEMIC in the West, which brings on secondary characteristics like the way people look, how large they are, and everything else including the size and shape of their faces and other "parts." In cultures where the common food is constipating, for example, you might see a whole culture with real wide noses--indicating colon blockage. In cultures subsisting on dry foods like flour-mixed-with-water you may have "gnarled oak" anatomies (long trunk, short legs).