WASHINGTON — What if my blood sugar's too high today? Is it time for my blood pressure pill? With nagging text messages or more customized two-way interactions, researchers are trying to harness the power of cell phones to help fight chronic diseases.

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After all, most of the population now carries a cell phone. Accessing the Internet with them is on the rise, too — nearly 40 percent of cell callers do, the Pew Internet & American Life Project reported last week — allowing more sophisticated digital health contact.

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