Again, you seem to suggest that the end result (diabetes) back then was predetermined for many people. The facts don't support such a thing. Best estimates show that less than 10% of the US population is diabetic today. That's still a lot of people, but with one-third of all Americans considered obese today, it is not surprising. Given that just three generations ago obesity was rare, it is reasonable to conclude that diabetes then was also rare, even though the average lifespan was shorter than it is today.
>> Best estimates show that less than 10% of the US population is diabetic today.
25% of the population has an abnormally high glucose level which qualifies for pre-diabetes. Add your value of 10%, and that amounts to 1/3 of the population.