This episode is brought to you by Rupa Health, Levels, and ARMRA Colostrum.  In an ideal world where soils are rich and the air and water are pure, we would be able to get all of the vitamins and nutrients we need through diet alone. However, for most, that’s just not practical in our toxic world. In today’s episode, I talk with Dr. Michael Murray, Fred Provenza, Dan Kittredge, and Jeff Tkach about the symbiotic relationship between plants and soil and why supplements may be necessary to make up for the lack of nutrients in the foods we eat. Dr. Michael Murray is a doctor of naturopathy, a field of alternative medicine that seeks to harness the power of nature to prevent illness and achieve the highest level of health possible. He is the Chief Science Advisor for iHerb and the author of more than 30 books, including The Encyclopedia of Natural Medicine Third Edition and The Longevity Matrix. Fred Provenza is a professor emeritus of behavioral ecology in the Department of Wildland Resources at Utah State University. He is the author of three books, including Nourishment: What Animals Can Teach Us about Rediscovering Our Nutritional Wisdom; Foraging Behavior: Managing to Survive in a World of Change; and The Art & Science of Shepherding: Tapping the Wisdom of French Herders (co-written with Michel Meuret). Dan Kittredge has been an organic farmer for more than 30 years and is the founder and executive director of the Bionutrient Food Association, a nonprofit whose mission is to “increase quality in the food supply.” Out of these efforts the Real Food Campaign was born, which has engineered a prototype of a handheld consumer spectrometer designed to test nutrient density at point of purchase. Jeff Tkach serves as the Chief Impact Officer for the Rodale Institute. Jeff is responsible for expanding Rodale Institute’s global influence in healing people and the planet by unlocking the transformational power of regenerative organic agriculture. Jeff served on the Rodale Institute’s board of Directors in 2016, where he was instrumental in fostering relationships between the organization and business leaders in the organic food industry. This episode is brought to you by Rupa Health, Levels, and ARMRA Colostrum.  Rupa Health is a place where Functional Medicine practitioners can access more than 3,000 specialty lab tests from over 35 labs. Check out a free, live demo with a Q&A or create an account at RupaHealth.com. Levels is offering an additional two free months of their annual membership at levels.link/HYMAN. Receive 15% off your first order of ARMRA Colostrum at tryarmra.com/MARK or enter MARK to get 15% off. Find full-length episodes of these interviews (and mentioned references) here: Dr. Michael Murray Fred Provenza Dan Kittredge Jeff Tkach