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

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).In one type of study, called a case-control study, cell phone use is compared between people with these types of tumors and people without them.In another type of study, called a cohort study, a large group of people who do not have cancer at study entry is followed over time and the rate of these tumors in people who did and didn’t use cell phones is compared.Electromagnetic fields in the radiofrequency range are used for telecommunications applications, including cell phones, televisions, and radio transmissions.The human body absorbs energy from devices that emit radiofrequency electromagnetic radiation.The energy of electromagnetic radiation is determined by its frequency; ionizing radiation is high frequency, and therefore high energy, whereas non-ionizing radiation is low frequency, and therefore low energy.

The NCI fact sheet Electromagnetic Fields and Cancer lists sources of radiofrequency energy.

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).

This investigation is being conducted in highly specialized labs that can specify and control sources of radiation and measure their effects.

However, researchers have reported some statistically significant associations for certain subgroups of people.

Three large epidemiologic studies have examined the possible association between cell phone use and cancer: Interphone, a case-control study; the Danish Study, a cohort study; and the Million Women Study, another cohort study.

Its only consistently observed biological effect in humans is tissue heating.