The last time your doctor asked how much you exercise, did you tell the truth? Do you even really know the truth—not just how many visits to the gym you've made this month, but how many hours you sit or how many calories you burn in a day?
What if your doctor had already received the information from a tiny device built into your cell phone, wallet, or undershirt? Sonny Vu believes a device like this could fundamentally change health care. "You can't just lie to your doctor—it's all there, recorded," he says. "You cut right to the chase rather than having to tease out all that information."
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