Weston Price traveled the world studying cultures and diets and he was a dentist. He found specific types of diets affected many things including the bone structure of the face and jaw. That along with tooth decay are completely diet related. Since bone and hair seem to have a connection I would not dismiss this theory.
If you do some reading on Epigenetics what you will find is that it s not always the present generation that created their issue but generations passed which then becomes encoded in the DNA. Pottenger s cats is a good example of the study of a raw diet as opposed to a cooked food diet for carnivores. The damage presents itself a few generation down the line. I m sure we will see the same with GMO, cell phones, etc in the coming decades.
People tend to believe what they have been conditioned to believe. It s like dirt ¦ ¦ ¦kids playing in the dirt is a very healthy activity. The bacteria in the dirt creates a stronger immune system and some of that bacteria is also responsible for serotonin production. So you end up with a healthy happy kid playing in the dirt. But instead most people believe that should keep the kid sterile something on the order of a Michael Jackson and they end up with something that is just the opposite, a child with issues that could have easily been avoided. But I m sure the handi wipes business to keep you sterile love the billions they rake in keeping many uninformed.
Another good example of something that seems so benign yet creates an issue later in life would be a root canal. The bacteria becomes trapped and many suffer heart issues later in life. It's fairly well known and the point is most would not make a connection as dentists that do not follow a holistic approach are well known for selling the root canal. The body seems to have many connections which we simply do not understand at this moment in time. So the hair/mouth health connection could very well be true.