| Himself | Joey Aucoin | |
| Himself (as Neal Barnard M.D.) | Neal Barnard | |
| Himself | Gene Baur | |
| Herself | San'Dera Brantley-Nation | |
| Himself (as Junshi Chen Ph.D.) | Junshi Chen | |
| Himself | Mac Danzig | |
| Herself (as Connie Diekman MEd RD FADA) | Connie Diekman | |
| Himself (as Caldwell Esselstyn Jr. M.D.) | Caldwell Esselstyn Jr. | |
| Himself | Rip Esselstyn | |
| Herself | Ruth Heidrich | |
| Himself (as David Klurfeld Ph.D.) | David Klurfeld | |
| Himself (as Matthew Ledderman M.D.) | Matthew Lederman | |
| Himself (as Doug Lisle Ph.D.) | Doug Lisle | |
| Himself (as Terry Mason M.D.) | Terry Mason | |
| Himself (as John McDougall M.D.) | John McDougall | |
| Herself | Evelyn Oswick | |
| Herself (as Pam Popper N.D.) | Pam Popper | |
| Herself (as Alona Pulde M.D.) | Alona Pulde | |
