It is a current theory. It is far from being the current theory, and IMO a woefully insufficient one. I'm not a clean freak by any means and still developed a c

It is a current theory. It is far from being the current theory, and IMO a woefully insufficient one. I'm not a clean freak by any means and still developed a couple dozen food allergies as an adult. Ultimately the immune system is hopelessly complex and this will likely take decades more for us just to arrive at the right theory.