I think SES is just a very poor proxy for IQ. Higher IQ people are a lot healthier than lower IQ people regardless of SES. Probably quite a bit of that is just

I think SES is just a very poor proxy for IQ. Higher IQ people are a lot healthier than lower IQ people regardless of SES. Probably quite a bit of that is just genetic (mutational load lowers both IQ and general health) and diet details are secondary. These observational studies are mostly worthless because they are not controlling for the right things.