Sourdough bread is not a new food trend. It has been around for thousands of years, the traditional baking methods having been passed down through generations. Indeed, an 84-year-old Canadian woman was recently thrust into the international spotlight for being the proud owner of a 120-year-old sourdough starter. And it is the starter, which is the fundamental difference between sourdough and traditional bread recipes. It is also the secret to why sourdough bread is actually good for us.