On December 27, I closed MDPrevent, the preventive-medical practice that I co-founded three years ago in Delray Beach, Florida. The practice was created with the premise that patients would be better off if doctors focused their attention more on preventing disease than simply treating it. In clinical parlance, "primary prevention" means preventing disease occurrence, while "secondary prevention" means early diagnosis and treatment of existing disease before it causes significant harm. The thrust of MDPrevent was primary prevention: to help patients identify their risk factors for the major chronic diseases and leading killers, such as diabetes, heart and lung disease, stroke, and cancer, and to help them make lifestyle changes to prevent these factors from evolving to illness.