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The ability of microwave ovens to heat food is one example of this effect of radiofrequency energy.Radiofrequency exposure from cell phone use does cause heating to the area of the body where a cell phone or other device is held (ear, head, etc.).

Electromagnetic radiation can be categorized into two types: ionizing (e.g., x-rays, radon, and cosmic rays) and non-ionizing (e.g., radiofrequency and extremely low frequency, or power frequency).

However, it is not sufficient to measurably increase body temperature, and there are no other clearly established effects on the body from radiofrequency energy.

It has been suggested that radiofrequency energy might affect glucose metabolism, but two small studies that examined brain glucose metabolism after use of a cell phone showed inconsistent results.

The authors of these studies noted that the results are preliminary and that possible health outcomes from changes in glucose metabolism are still unknown.

Such inconsistent findings are not uncommon in experimental studies of the biological effects of radiofrequency electromagnetic radiation (5).

Some contributing factors include assumptions used to estimate doses, failure to consider temperature effects, and lack of blinding of investigators to exposure status.

Epidemiologic studies use information from several sources, including questionnaires and data from cell phone service providers.

More information about ionizing radiation can be found on the Radiation page.

The frequency of radiofrequency electromagnetic radiation ranges from 30 kilohertz (30 k Hz, or 30,000 Hz) to 300 gigahertz (300 GHz, or 300 billion Hz).

Whereas one study showed increased glucose metabolism in the region of the brain close to the antenna compared with tissues on the opposite side of the brain (2), the other study (3) found reduced glucose metabolism on the side of the brain where the phone was used.

Another study investigated whether exposure to the radiofrequency energy from cell phones affects the flow of blood in the brain and found no evidence of such an effect (4).

The National Institute of Environmental Health Sciences (NIEHS), which is part of the National Institutes of Health (NIH), is carrying out a large-scale study in rodents of exposure to radiofrequency energy (the type used in cell phones).