Self - Investigative Science Journalist / Author

Gary Taubes

Acting

Self - Investigative Science Journalist / Author

Nina Teicholz

Acting

Self (Archival footage) - Physiologist

Ancel Keys

Acting

Self - Scientist / Author / Professor Emerita

Tim Noakes

Acting

Self - Narrator / Nutritionist / Functional Medicine Physician

Mark Hyman

Acting

Self - Cardiologist

Bret Scher

Acting

Self - Obesity Specialist

Sarah Hallberg

Acting

Self - Obesity Researcher

Zoe Harcombe

Acting

Self - Cardiologist

Salim Yusuf

Acting

Self - Pediatric Endocrinologist

Robert Lustig

Acting

Self - Diabetes Specialist

Jason Fung

Acting

Self - Comedian (archive footage)

Bill Maher

Acting

Self - Obesity Specialist

Eric Westman

Acting

Self - Certified Nutritionist

Jonny Bowden

Acting

Self - President (archive footage)

Dwight D. Eisenhower

Acting

Self - Certified Diabetes Educator

Alyssa Gallagher

Acting

Self - US Army Pilot

Brian Gaudette

Acting

Self - Internal Medicine Physician

Brian Lenzkes

Acting

Self - Founder and CEO, LowCarbUSA

Doug Reynolds

Acting

Self - Founder, Bulletproof

Dave Asprey

Acting