I’m not sure it’s so simple. Socioeconomic studies indicate that the worse shape you’re in, the less social mobility you are likely to have. Moving on a whim might not be possible for many of these people.

On the other hand, contaminants concentrating further down stream is a known phenomenon and we known we’ve inundated many places with hormone disrupting substances. It doesn’t seem all that complicated or far fetched.

Both could be factors, and I’m not aiming to be contrarian so much as investigate the possibilities a bit. It’s an interesting topic