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 (Archival footage) / Comedian

Eric Westman

Self / Obesity Specialist

Jonny Bowden

Self / Certified Nutritionist

Dwight D. Eisenhower

Self (Archival footage) / President

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