We’re big fans of health apps, those clever little programs that convert your smartphone or tablet into a stress reliever, workout buddy, healthy eating log, even a personal assistant that tracks your blood pressure, blood sugar, vision, sleep and a lot more. But with 40,000-plus to choose from, how do you know where to start?

Good question. App stores don’t have authoritative medical reviewers — yet — to make sure health apps live up to their claims. And apps are big business ($1.4 billion by the end of this year!), which means big hype.

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