1) Distance cell phone from head
Cell phones are usually held near the head when being used, which causes a big concern as to whether or not they might cause or contribute to tumors in this area. The body tissues closest to the phone absorb more energy than tissues farther away. It is possible that cell phones could cause the following: malignant brain tumors such as gliomas, non-cancerous tumors of the brain such as meningiomas, non-cancerous tumors of the nerve connecting the brain to the ear, and non-cancerous tumors of the salivary glands.
2) Carrying cell phone on body
The human body absorbs energy from devices that emit radiofrequency electromagnetic radiation. The dose of the absorbed energy is estimated using a measure called the specific absorption rate (SAR) which is expressed in watts per kilogram of body weight. The upper limit of SAR allowed in the United Sates is 1.6 watts per kilogram of body weight. SAR values on phones can be misleading. The listed SAR value is based only on the phone operating at its highest power, not on what users would typically be exposed to with normal phone use. It's possible that a phone with a lower listed SAR value might actually expose a person to more radiofrequency energy than one with a higher listed SAR value in some cases based on a number of factors.
Many different factors can affect the amount of radiofrequency energy to which a person is exposed, including:
- the model of phone being used - different phones give off different amounts of energy
- the amount of cell phone traffic in the area at the time - higher traffic may require more energy to get a good signal
- the distance and path to the nearest cell phone tower - cell phones adjust their power to use the minimum amount for a good signal, being farther away from the tower requires more energy to get a good signal, as does being inside a building
- whether or not the person is using the speaker mode on the phone or a hands-free device - using one of these allows the phone to be held away from the head
- the amount of time the person is on the phone
3) Heating versus non-heating effects
Heating is the only consistently recognized biological effect of radiofrequency energy. Radiofrequency waves can heat up body tissues when they are at very high levels. This is the basis of how microwave ovens work. Radiofrequency exposure from cell phone use does cause some heating to the area of the body where a cell phone or other device is held. However, it is not sufficient to measurably increase body temperature. It is unclear exactly how cell phones are affecting our bodies and our brains, and more research is needed to look at possible long-term effects. For example, 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. Exposure to ionizing radiation, such as from x-rays, is known to increase the risk of cancer. However, even though there have been many studies that examined the potential health effects of non-ionizing radiation from radar, microwave ovens, cell phones, and other sources, as of right now, there is no consistent evidence that non-ionizing radiation increases cancer risk.
4) WiFi
WiFi uses radiofrequency to transmit data through the air. WiFi radiation is a type of EMF. Although WiFi radiation may not cause a thermal heating effect and is non-ionizing, it gives off low level wave radiation that could potentially have harmful effects on the body such as: DNA chain breaks, increased blood-brain barrier permeability, disruption to brain glucose metabolism,creation of stress proteins, and disruption of cell metabolism. Numerous studies have also linked WiFi radiation exposure with cancer.
To minimize your exposure to WiFi radiation:
- turn off your WiFi when you're not using the internet and especially when you go to sleep at night
- avoid using WiFi while you're in a vehicle
- choose to use a hardwired Ethernet connection in your home instead of wireless
- situate wireless modems/routers, as far as possible from your bedroom and from rooms where you spend a lot of time
- be mindful of WiFi radiation exposure from neighbors
5) EMF's
Cellphones emit a kind of energy called radiofrequency EMFs (electromagnetic fields). EMFS are types of radiation that are created by all electronic devices. Cell phones emit relatively weak EMFs, but because they are used frequently and kept close to the head and body, cell phone EMFs can affect nearby cells and tissues.To lower your exposure to EMFs from cellphones, you could increase the distance between you and your phone. This could be done by:
- sending text messages
- using the speaker phone
- use a headset and carry your phone away from your body
- keep your phone away from your body
- limit your cell phone use when reception is weak
- reduce the amount of time spent talking on a cell phone
- keep cell phone calls short
- use speaker phone mode or a corded phone for longer conversations
- take off your headset when you're not on a call
- do not rely on devices that claim to shield or neutralize EMFs from cell phones because these devices have not been shown to reduce exposures
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