I read something in a library book years ago about eating what your racial ancestors ate.  Not broadly as in the caveman diet I read about online these days, but more specific to the continent and region your ancestors lived, be it goats or seafood or rice or corn.   The useful ADHD gene you mention reminds me of a Facebook quote attributed to Temple Gradine, "where would we be without the autism gene?  We'd still be sitting around in caves, socializing, getting nothing done".  


Youth lives by personality, age lives by calculation. -- Aristotle on a calendar