You’re absolutely mistaken if you think that people wouldn’t notice 1-in-28 children of any generation being autistic, doctor or no doctor.
Hmmm, I don’t know about Northern Europeans, but Indians who come to the US (or the west in general) have a fairly high rate of heart disease. Yes, diet absolutely plays a part in Heart Disease, is anyone surprised.
The Dravidian people in SE India are really different from the others. They do not have a serious cholesterol problem. That doesn’t mean they don’t have a heart attack problem of course, but the causes are different.
http://somalidoc.com/smf/index.php?topic=968.0 is rather informative. I think you could have 10 out of 28 with different levels of autism and their families/tribes would keep that hidden in Somalia!