Scotch/Irish and Seminole/Cherokee... very sensitive to carbs. I get fat easily if I eat too many, my blood sugar gets too high. Even when it comes to alcohol, I simply cannot tolerate it. 2 drinks and I'm done.
But on the reservation, the Indian's (we don't say Native American here) inability to process carbs is well known. My theory is because of less time for natural selection to "weed out" those who couldn't adapt easily and pass on that DNA to adapt to a high carb diet to their offspring. Modern medicine stops natural selection in this case. 12000 - 17000 years of adaptation vs only a few hundred since being "adapted" over the barrel of a gun... guess who's not adapted to the neolithic way of eating? Guess where EVERYONE is a diabeitc? Guess where EVERYONE has renal failure. Guess where EVERYONE ends on dialysis and gets DM related amputations?
Oh yeah, guess who CURED his MS and his IDDM with a high fat, moderate protein, low carb diet? Yep...me. :)
So my Scotch/Irish blood made me good looking (the only blonde haired blue eyed guy HERE had to say that)....it didn't give me any carb tolerance. :(