Dr Weston Price, an American dentist living in the 1930s, was confounded as to why so many of his patients were experiencing cavities and poor dental health gum. He decided to take a break from his dental practice and travel around the world with his nephew who worked for National Geographic. He was astounded to find that on every continent he traveled to, he found the same phenomena. Peoples who ate their traditional, unrefined diets using ancient techniques of food preparation (soaking whole grains, fermenting vegetables, lacto-fermented or raw dairy products) were almost entirely free of cavities and gum disease and displayed smiles of straight, uncrowded teeth. These same genetic peoples, once placed into cities and on diets of modern, refined food suffered rapid and dramatic declines in their health.