Brain Reacts to Cellphones

Cellphone use appears to increase brain activity in regions close to where the phone antenna is held against the head, according to a new study, but researchers said the implications for health are still unknown.
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The main concern is that radiation from phones could cause DNA mutations or changes to chemicals in the brain, leading to tumors or cognitive decline. But to date there is no known evidence that the frequency of the waves emitted from phones are powerful enough to cause such changes, according to Reto Huber, a professor at the University Children's Hospital Zurich who has published several studies on electromagnetic fields and cellphones but wasn't part of this latest study.

In Tuesday's study, researchers from the National Institutes of Health in Bethesda, Md., and Brookhaven National Laboratory in New York measured glucose metabolism—how much sugar a cell takes in to fuel activity—in the brains of 47 adults, the largest study of its kind to date.