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).