| Person | Type | Job | Role(s) |
|---|---|---|---|
 Serena Scott Thomas | Crew | Production | Producer |
 Cody Peterson | Crew | Sound | Sound Recordist |
Peter Curtis Pardini | Crew | Directing | Director, Editor, Producer, Sound Designer |
John Honoré | Crew | Camera | Director of Photography |
Matt Kendrick | Crew | Sound | Sound Recordist |
 Vinnie Tortorich | Crew | Production | Producer |
 Jim Abrahams | Cast | Actor | Self - Father / Founder, Charlie Foundation / Filmmaker |
 Gary Taubes | Cast | Actor | Self - Journalist / Author |
 Drew Pinsky | Cast | Actor | Self - Physician |
 George McGovern | Cast | Actor | Self - Politician (archive footage) |
Vinnie Tortorich | Cast | Self - Narrator / Producer / Trainer / Author | |
 Nina Teicholz | Cast | Actress | Self - Journalist |
 Ancel Keys | Cast | Self (archive footage) | |
 Andreas Eenfeldt | Cast | Actor | Self - Physician |
Ivor Cummins | Cast | Self - Biochemical Engineer | |
 Georgia Ede | Cast | Self - Psychiatrist | |
 Jeffry Gerber | Cast | Actor | Self - Physician |
 Eric Westman | Cast | Actor | Self - Internal Medicine Doctor |
Gary Fetke | Cast | Self - Orthopaedic Surgeon | |
 Bret Scher | Cast | Actor | Self - Cardiologist |
Vilhjalmur Stefansson | Cast | Self - Explorer (archive footage) | |
| Person | Type | Job | Role(s) |
