That may be true, but diabetes rates have spiked in the US (and in every country that adopted a Western diet) during the 20th century even though our genetics h

That may be true, but diabetes rates have spiked in the US (and in every country that adopted a Western diet) during the 20th century even though our genetics haven't changed. That points to the proximate cause being the change in diet, which means we should figure out 1) what changed in our diet and 2) which change led to obesity.