Gary Taubes

Self - Author

Robert Lustig

Self - Doctor of Pediatric Endocrinology

Craig Wilcox

Self - Researcher, Okinawa Centenarian Study

Alexis Gomez

Self - Former Patient of Dr. Lustig

Cristin Kearns

Self - Dentist, Denver, Colorado

Yoni Freedhoff M.D.

Self - University of Ottawa

Jean-Marc Schwartz

Self - Biochemist

John Yudkin

Self (archive footage)

Ancel Keys

Self (archive footage)

Sami Inkinen

Self - Endurance Athlete