“More research is needed.” That’s a common final sentence in scientific papers, especially when it comes to studying the effects of environmental chemicals on health. With numerous chemical reactions going on in our body all the time, and exposure to thousands and thousands of chemicals, both natural and synthetic, it is a huge challenge to tease out the effects of a single substance. That brings up the question of when the effort and funds invested in studying a chemical have been sufficient. Is there a point at which further research is unlikely to lead to a major revelation? Can research funds be better spent on alternate projects that are more likely to yield meaningful results?
We may be reaching such a stage with bisphenol A (BPA), a chemical that has been the subject of more studies in the toxicological literature than any other.