IIRC you can analyze dental calculus found on teeth and detect the proportions of various protein sources in the diet of that individual, but IDK how far back i

IIRC you can analyze dental calculus found on teeth and detect the proportions of various protein sources in the diet of that individual, but IDK how far back in time you can do this. Several hundred years is certainly possible, Medieval cemeteries can be analyzed like that. (Whenever my dentist cleans my calculus, we joke that we are ruining some future archeologist's work :)