Guy MacGillivray on Sugar and Mental Health – Our Most Downloaded Episode Ever! This episode is a game-changer! Our conversation with Guy MacGillivray has become the top episode of all time—and for good reason. Guy is a psychologist and social worker in Port Lincoln, a devoted father of three, and a passionate advocate for people with disabilities. But his journey into understanding sugar and mental health started with a personal revelation: he was using sugar to medicate stress in his ...