Today on Health & Longevity, Dr. John Westerdahl's featured guest is Brenda Davis, R.D.. a Registered Dietitian Nutritionist and Vegetarian/Vegan Nutrition Expert. Registered Dietitian Nutritionist Brenda Davis discusses how a healthy vegan diet is an optimal diet  approach to achieve health and longevity.  She is the coauthor of the bestselling books, Becoming Vegan Comprehensive Edition – The Complete Reference to Plant-Based Nutrition and Becoming Vegan : Express Edition.