Gary Taubes
Self - Investigative Science Journalist / Author
Nina Teicholz
Self - Investigative Science Journalist / Author
Ancel Keys
Self (Archival footage) - Physiologist
Tim Noakes
Self - Scientist / Author / Professor Emerita
Mark Hyman
Self - Narrator / Nutritionist / Functional Medicine Physician
Bret Scher
Self - Cardiologist
Sarah Hallberg
Self - Obesity Specialist
Zoe Harcombe
Self - Obesity Researcher
Salim Yusuf
Self - Cardiologist
Robert Lustig
Self - Pediatric Endocrinologist
Jason Fung
Self - Diabetes Specialist
Bill Maher
Self - Comedian (archive footage)
Eric Westman
Self - Obesity Specialist
Jonny Bowden
Self - Certified Nutritionist
Dwight D. Eisenhower
Self - President (archive footage)
Alyssa Gallagher
Self - Certified Diabetes Educator
Brian Gaudette
Self - US Army Pilot
Brian Lenzkes
Self - Internal Medicine Physician
Doug Reynolds
Self - Founder and CEO, LowCarbUSA
Dave Asprey
Self - Founder, Bulletproof
