Today on Health & Longevity, Dr. John Westerdahl features guest Elson Haas, M.D., preventive medicine expert and Founder and Director of the Preventive Medical Center of Marin in San Rafael, California. Dr. Elson Haas discusses the role that detoxification and cleansing can play in health and longevity. He discusses the role that fasting can play as a treatment in improving health. Dr. Haas is author of 'The Detox Diet'.