Nina Teicholz
Self - Journalist

Dominique Dupagne
Self - Medical Journalist

Harvey Levenstein
Self - Food Historian

Gary Taubes
Self - Scientific Journalist

Henry Blackburn
Self - Epidemiologist

Michel de Lorgeril
Self - Cardiologist

Uffe Ravnskov
Self - Physician

Sylvain Duval
Self - Nutritionist

Frank Pfrieger
Self - Neuroscientist

Sally Fallon Morell
Self - Nutritionist

Kilmer McCully
Self - Pathologist

Cristin Kearns
Self - Medical Researcher

Jeremy Green
Self - Medical Historian

Mikael Rabaeus
Self - Cardiologist

John Abramson
Self - Medicine Professor

Beatrice Collomb
Self - Medicine Professor

Ancel Keys
Self - Nutritionist (archive footage)

Margaret Keys
Self - Nutritionist (archive footage)

Jules Bergman
Self - Scientific Journalist (archive footage)

William Castelli
Self - Physician (archive footage)