Since obesity causes millions of deaths annually, solving this warrants a covid-scale response. It should therefore be easy enough to direct a few billion dollars of funding into hundreds of avenues of research to find which those handful of pollutants are, what the main sources of them are, how to remove them, and how the effects of damage already done might be reversed.
I imagine that with a covid-scale response, we could guarantee that nothing new would contain any of the offending chemicals within a year, and perhaps within 5 years we could have replaced every piece of tupperware/insulation foam/whatever already manufactured goods contain it.