Astudy examined the impact of cell phone use on brain metabolism in 47 healthy adults. a quote from the published abstract is: "cell phones were placed on the left and right ears and positron emission tomography with (18f) fluorodeoxyglucose injection was used to measure brain glucose metabolism twice, once with the right cell phone activated (sound muted) for 50 minutes (on condition) and once with both cell phones deactivated (off condition). the published findings indicate that metabolism in the region closest to the antenna (orbitofrontal cortex and temporal pole) was significantly higher for on than off conditions