"As of April 2012, 84% of smartphone owners had downloaded an app of any kind to their phone. By comparison, 19% have downloaded an app specifically to track or manage health. Women, those under age 50, those better educated, and those with an annual household income over $75,000 are more likely to have downloaded a health app...Exercise, diet, and weight apps are the most popular types of health apps downloaded. Some 38% of health app users track their exercise, 31% monitor their diet, and 12% use an app to manage their weight. Other health apps track menstrual cycles, blood pressure, pregnancy, blood sugar or diabetes, and medication."
Via Allison Hermann, PhD