Behaviour changes such as improving nutrition, increasing physical activity, and decreasing obesity are linked with lower mortality and morbidity and fewer cancers. Health promotion programs in the workplace are a promising way to reach a large segment of the population. This project evaluated the efficacy of three approaches - all of which were based on previous research and programs with demonstrated positive benefits - on cancer-related outcomes (healthy eating, physical activity, normal body weight) and work-related outcomes (absenteeism, presenteeism).