Although clinical diabetes mellitus is still rare, more Eskimos were intolerant of glucose in 1972 than was true ten years earlier. Also, a higher proportion of the population was overweight. The high tolerance for glucose in these people does not appear to have a genetic basis, but may instead be associated with physical activity and physical fitness.
Mouratoff GJ, Scott EM. Diabetes Mellitus in Eskimos After a Decade. JAMA. 1973;226(11):1345-1346. doi:10.1001/jama.1973.03230110037007