https://goo.gl/gpbXOH
If you prefer getting your research information by watching and listening instead of reading, here are a couple of video presentations by the esteemed Dr Stephen J. Genuis, who is one of the leading experts on environmental health.
In these presentations he discusses the increases in chronic illness and mental health problems, chemical and other causes and effects, shortcomings in our health care systems, as well as some treatment options to improve health.
I’ve also linked to related research for those of you who like to read.