Fort Collins, CO gets water almost exclusively from rivers starting nearby and still has an 18% obesity rate (and Boulder is similar but has 12%). Both of those are “low” compared to other places, but still way above the historical level.
(I admit that I’m less interested in the water hypothesis since I live in Fort Collins so that part is already solved for me)
I thought it was a mix:
Lithium from drinking water
Lithium concentrated in certain foods (see Wolfberry section in https://slimemoldtimemold.com/2021/10/11/a-chemical-hunger-interlude-g-li/ for example)
Fort Collins, CO gets water almost exclusively from rivers starting nearby and still has an 18% obesity rate (and Boulder is similar but has 12%). Both of those are “low” compared to other places, but still way above the historical level.
(I admit that I’m less interested in the water hypothesis since I live in Fort Collins so that part is already solved for me)