Enviromental Factors most heavy metals occur naturally, their release as byproducts of manufacturing and other industrial and/or technological processes are man-made. Plus, God did not create plastic bottles and containers, pesticides, cleansers, solvents, and the like-we did. The best rule of thumb is not to ingest anything with a name that’s impossible pronounce, much less spell!
I think you raise a point that is an important health consideration. These are not issues often tackled by fitness professionals. The pull here is that most fitness professionals are not specifically trained in ecological science. It would be an interesting suggestion to include in the practical training and certification of those who will work in this area information about the health impact of environmental toxins. While the jobs we do do not include acting on these issues as a part of our daily work, being able to understand the health impact of such things and explain them to students/clients could be a part of the general work we do to impact clients daily drive to increase wellness.
I did have a conversation with a scientist recently who said that he thought the statement that one should not eat things one cannot pronounce was a simplification. There are things that are both health and natural that if stated in their scientific name could look daunting. As a general point I do look at labels before I buy something and reject things with a lot of additives. But I think it is important to become educated on what some of those additives are, so I can make a more nuanced choice.