Dr. John Westerdahl, PhD, MPH, MA, RDN, CNS, FAND, is a leading authority in the fields of food, nutrition, wellness, and lifestyle medicine. He is a registered dietitian nutritionist, certified nutrition specialist, master herbalist, board-certified anti-aging health practitioner, health scientist, health educator, and radio talk show host. Dr. Westerdahl is a Fellow of the Academy of Nutrition and Dietetics. He is also a past chair of the Vegetarian Nutrition Dietetic Practice Group of the Academy of Nutrition and Dietetics.

He graduated from Loma Linda University School of Public Health and specializes in nutrition counseling with a focus on whole food, plant-based diets, lifestyle medicine, anti-aging, and longevity.