I use the word "alien" simply to mean a food which the human body has not
had enough experience with to have evolved the ability to deal with it
completely successfully.  There is probably a better word to use but none
comes to mind at the moment.

I agree with the rest of this.

John Pavao

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"Alien" is an emotion-laden term.  Strictly speaking, anything
that is not part of the body is alien to it, and that includes
all foods.  The point is simply that if a food requires cooking
to be edible, humans can only have been eating it since they have
been able to cook.  We don't know exactly how long that is, but
the key thing is that we have had less time to adapt to those
foods than to foods that don't require cooking.