Today we’re going to talk about two theories. Almost everyone holds one of these theories to be true, and it determines their beliefs on sickness, health, and wellness. A theory,  by definition, is a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained. Also, theories, by their very nature, are not facts, but well-substantiated explanations for a phenomenon or a collection of facts.