The best weapon in the battle against obesity may already be in the hands of children and teenagers, reports The Lookout. That’s the thinking behind the work of several researchers and technologists around the country who hope to turn cell phones into devices that can help young people make healthier food and lifestyle choices. A recent Pew Internet study found that 78 percent of teens now have a cell phone, and almost half of them–47 percent–own smart phones with computing capability…

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