A study conducted by the Federal Trade Commission looked at 12 different health and fitness apps and found they sent user information to 76 different third parties. The FTC looked at two daily activity apps connected to wearables, two exercise apps, two dietary and meal apps and three system checker apps. Four of the 12 apps were found sending data to one specific ad company and some of them didn t even bother anonymizing the information. Another study found a large percentage of 43 paid fitness and exercise apps did not have privacy policies.
Source: https://threatpost.com/health-and-fitness-apps-poor-at-protecting-privacy-ftc-says/105976/