Comment by anonymouskimmer

I may have seen it here, but there's a new article out on childhood fluoride exposure: https://www.science.org/doi/10.1126/sciadv.adz0757

"Whereas most prior research has estimated effects of exposure to extremely high levels of fluoride, we consider exposure to levels of fluoride within the range typical in most places and of greatest relevance to policy debates about government water fluoridation. We use data from the nationally representative (United States) High School and Beyond cohort, characterize fluoride exposure from drinking water across adolescence, adjust for confounders, and observe cognitive test performance in both secondary school and at age ~60. We find that children exposed to recommended levels of fluoride in drinking water exhibit modestly better cognition in secondary school, an advantage that is smaller and no longer statistically significant at age ~60."

I'm very much overweight, though not morbidly obese. I have been at my best weight when I did "get out and move". The problem, of course, is that schools, jobs, and modern infrastructure don't make that as easy to do as in prior decades. You can't just tell people to do something that has been made difficult to do and expect them to do it.