Bret Scher
Self - Cardiologist
Gary Taubes
Self - Journalist / Author
Dave Feldman
Self - Software Engineer
Eric Westman
Self - Internal Medicine DoctorAndreas Eenfeldt
Self - Physician
Drew Pinsky
Self - Physician
Georgia Ede
Self - PsychiatristNina Teicholz
Self - JournalistVilhjalmur Stefansson
Self - Explorer (archive footage)Ancel Keys
Self (archive footage)
