Jim Abrahams as Self - Father / Founder, Charlie Foundation / Filmmaker

Vinnie Tortorich as Self - Narrator / Producer / Trainer / Author

Bret Scher as Self - Cardiologist

Gary Taubes as Self - Journalist / Author

Dave Feldman as Self - Software Engineer

Eric Westman as Self - Internal Medicine Doctor

Andreas Eenfeldt as Self - Physician

Drew Pinsky as Self - Physician

Georgia Ede as Self - Psychiatrist

Nina Teicholz as Self - Journalist

Vilhjalmur Stefansson as Self - Explorer (archive footage)

Ivor Cummins as Self - Biochemical Engineer

Ancel Keys as Self (archive footage)

Jeffry Gerber as Self - Physician

George McGovern as Self - Politician (archive footage)

Gary Fetke as Self - Orthopaedic Surgeon