The film follows Donal–a lean, fit, seemingly healthy 41 year old man–on a quest to hack his genes and drop dead healthy by avoiding the heart disease and diabetes that has afflicted his family. When Kevin suffered a heart attack later in life, family and friends were shocked. How does a lean, fit and seemingly healthy man–who has sailed through cardiac stress tests–suddenly fall victim to heart disease? Can a controversial diet consisting of 70% fat provide the answers?