Indeed. In fact, as a tongue-in-cheek example in real life, you can see the subtle facial structure difference between Asians (say, southern Han Chinese in Fujian) versus 3rd generation Chinese Americans from the same region (with no mixed ancestry). Diet, language, facial muscle behaviors (e.g. frowning), and surrounding beauty standards may have contributed to differences in the mandibular (and elsewhere) structure. Western diet tends to be a bit more chewy and meaty than, say, softer carb-heavy southern Chinese diet.
