| AAnne GeorgetSelf - Narrator (voice) | Self - Narrator (voice) |
| NNina TeicholzSelf - Journalist | Self - Journalist |
| DDominique DupagneSelf - Medical Journalist | Self - Medical Journalist |
| HHarvey LevensteinSelf - Food Historian | Self - Food Historian |
 Gary TaubesSelf - Scientific Journalist | Self - Scientific Journalist |
| HHenry BlackburnSelf - Epidemiologist | Self - Epidemiologist |
| MMichel de LorgerilSelf - Cardiologist | Self - Cardiologist |
| UUffe RavnskovSelf - Physician | Self - Physician |
| SSylvain DuvalSelf - Nutritionist | Self - Nutritionist |
| FFrank PfriegerSelf - Neuroscientist | Self - Neuroscientist |
| SSally Fallon MorellSelf - Nutritionist | Self - Nutritionist |
| KKilmer McCullySelf - Pathologist | Self - Pathologist |
| CCristin KearnsSelf - Medical Researcher | Self - Medical Researcher |
| JJeremy GreenSelf - Medical Historian | Self - Medical Historian |
| MMikael RabaeusSelf - Cardiologist | Self - Cardiologist |
| JJohn AbramsonSelf - Medicine Professor | Self - Medicine Professor |
| BBeatrice CollombSelf - Medicine Professor | Self - Medicine Professor |
| AAncel KeysSelf - Nutritionist (archive footage) | Self - Nutritionist (archive footage) |
| MMargaret KeysSelf - Nutritionist (archive footage) | Self - Nutritionist (archive footage) |
| JJules BergmanSelf - Scientific Journalist (archive footage) | Self - Scientific Journalist (archive footage) |
| WWilliam CastelliSelf - Physician (archive footage) | Self - Physician (archive footage) |
| JJeremiah StamlerSelf - Epidemiologist (archive footage) | Self - Epidemiologist (archive footage) |
| GGeorge V. MannSelf - Nutritional Biochemist (archive footage) | Self - Nutritional Biochemist (archive footage) |
| JJoseph L. GoldsteinSelf - Biochemist (archive footage) | Self - Biochemist (archive footage) |
| MMichael Stuart BrownSelf - Biochemist (archive footage) | Self - Biochemist (archive footage) |
 Mandy PatinkinSelf - TV Spot Announcer (archive footage) | Self - TV Spot Announcer (archive footage) |
