"Your body is an ecosystem that can function most effectively when populated by diverse species of microorganisms. Sure, you can buy 'probiotic' nutritional supplements containing specific selected bacteria that promote healthy digestion. But by fermenting foods and drinks with wild microorganisms present in your home environment, you become interconnected with the life forces of the world around you... Wild fermentation is a way of incorporating the wild into your body, becoming one with the natural world. Wild foods, microbial cultures included, possess a great, unmediated life force, which can help us adapt to shifting conditions and lower our susceptibility to disease. These microorganisms are everywhere, and the techniques for fermenting them are simple and flexible."
Sandor Ellix Katz, Wild Fermentation (affiliate link)