C.J. Hunt as Self / Narrator / Main Subject

Leslie Aiello as Self / President, Wenner-Gren Foundation for Anth. Research

Loren Cordain as Self / Author / Professor of Health & Exercise Science, CO St. U

Michael Eades as Self / Author, Protein Power

Boyd Eaton as Self / Author, Paleolithic Prescription / Professor, Emory U.

Joel Fuhrman as Self / Center for Nutritional Medicine

David J. Getoff as Self / VP Price-Pottenger Nutrition Foundation

Alan Goldhamer as Self / President, Int'l Association of Hygienic Physicians

Adele Hite MPH R.D. as Self / Exec. Dir., Healthy Nation Coalition

Jean Jacques Hublin as Self / Dir., Human Evolution, Max Planck Institute

Maria Leung as Self / Founder Tasty Eats Soy Jerky

Shannon McPherron as Self / Paleolithic Archaeologist, Max Planck Institute

Sally Fallon Morell as Self / President, Weston A. Price Foundation

William Rendu as Self / PhD Anthropology Student

Professor Mike Richards as Self / Head, Archaeological Science Group, Max Planck Institute

Gary J. Sawyer as Self / Physical Anthropologist, American Museum of Nat. History

Barry Sears, Ph.D. as Self / Author / President, Inflammation Research Foundation

Lane Sebring, M.D. as Self / Board Examiner, American Academy of Anti-Aging Medicine

Dr. Marie Soressi as Self / Max Planck Institute for Evolutionary Anthropology

Gary Taubes as Self / Science Journalist / Author, Good Calories Bad Calories

Andrew Weil as Self / Director, Center for Integrative Medicine, U.Arizona

Robb Wolf as Self / Author / Former Research Biochemist

Jay Wortman, M.D. as Self / Métis Physician / Sr. Health Advisor

Kylie Wurl, R.D. as Self / Registered Dietician, Sebring Clinic

Susan Loraine Anderson as Runner

Ben Lamm as Young C.J. Hunt

Shelia P. Norton as EMT 1

Clay David as EMT 2

Kelly Ripa as Self / Talk Show Host

Michelle Obama as Self / First Lady