gavra:
I wasn’t referring to Basar Chamorim Bisaram (although I agree that would be an interesting discussion.) I think that is referring primarily to the Mitzriyam, although to a lesser extent other nochrim as well.
I am referring to a befeirus Chasam Sofer (I think I posted the mekor in the CR a few weeks ago) that says the Yidden are physically different than goyim AND (this is befeirush) the Chasam Sofer rules that all secular medical knowledge is only considered “perhaps” true when it comes to Jews, since Jews and non-Jews, it says in Chazal, have different physical natures, and medical research is done, generally, on non-Jews. All the more so where a person’s spiritual, psychological, etc. nature is concerned.