My husband was watching a television show about the radium girls - women who inadvertently ingested radium while working in factories in the early 20th century. They used their mouths to moisten paintbrushes and then used the painbrushes to apply a coating on watches. (If you are curious about it, you can read about it here.)
The next morning, I went to a local IANDS meeting and we had a guest speaker named Mark Pitstick, author of Radiant Wellness. He has a background in nutrition and talked extensively about the mind-body connection, but also how many of our ailments can be attributed to inadvertently digesting metals from processed foods.