Whether they have chronic ailments like diabetes or just want to watch their weight, Americans are increasingly tracking their health using smartphone applications and other devices that collect personal data automatically, according to health industry researchers.

“The explosion of mobile devices means that more Americans have an opportunity to start tracking health data in an organized way,” said Susannah Fox, an associate director of the Pew Research Center’s Internet and American Life Project, which was to release the national study on Monday. Many of the people surveyed said the experience had changed their overall approach to health.

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