Marketing is a force both in promoting and detracting from public health. The tobacco, alcohol, and food industries have long used behavioral theories, persuasion psychology, marketing science, and approaches from other disciplines to successfully influence the adoption of unhealthy products and behaviors. These theories also represent a powerful approach to promoting healthy eating and active living (HEAL) behaviors. More HEAL practitioners and researchers need to use marketing both to combat unhealthy marketing and to create more effective public health messages and programs. This workshop used two brief presentations and two interactive exercises to engage participants in the following topics:  Social marketing and messages to promote HEAL; Using social media to promote HEAL.