September 15, 2013 1 Comment
What follows is the text of my presentation from the Winnipeg Skeptics‘ fourth annual SkeptiCamp Winnipeg, an open conference celebrating science and critical thinking. Many thanks to everyone who attended and participated! We expect to have videos of all of the presentations online within the next little while.
Some of this presentation is adapted from a 2013 position paper my project team wrote for Bad Science Watch last year as part of our investigation into anti-WiFi activism in Canada. Bad Science Watch is an independent, non-profit science advocacy organization that aims to protect Canadian consumers by countering bad science in media and politics. The organisation is always looking for volunteers (and, of course, donations!). You can find out more at BadScienceWatch.ca.
So, cell phones and WiFi: What seems to be the problem?
Well, the problem is in the last few years we have an increasing number of people who are complaining that radiation generated by our modern conveniences (like computers, cell phones, appliances, and power lines) is responsible for a host of debilitating ailments in certain people who are “electromagnetically hypersensitive”. Activists are pushing for stricter government regulation, removal of wireless technology from schools, and radio-free zones.
To make sure that everyone’s on the same page, I’ll start with a bit of basic science.
First of all, what is radiation?
Well, “radiation” can mean a few different things. Generally, it’s the process by which energetic waves or particles travel through space. If you want to classify radiation broadly, there are two main ways you can do it: first, you can ask, “Is it particle radiation or electromagnetic radiation?” and second, “Is it ionizing or non-ionizing?”
Particle radiation occurs when large, unstable elements decay into smaller, more stable elements. Particle radiation often comes in the form of alpha particles (groups of two protons and two neutrons), beta particles (which are free electrons or positrons), or free neutrons. This sort of radioactive decay also results in a little bit of electromagnetic radiation (in the form of gamma rays), which we’ll talk about in a second. Particle radiation is a form of ionizing radiation (we’ll get to that too, but generally speaking that’s the bad stuff). We won’t be talking much about particle radiation today, but when people talk about stuff being “radioactive” this is often what they mean.
The second type of radiation is electromagnetic radiation. This is an energetic wave that propagates through space. Visible light is a type of electromagnetic radiation, and so are radio waves. EM radiation is a particular form of the more general electromagnetic field, which is a field produced by the movement of electrically charged objects, and which affects the behaviour of charged particles. Electromagnetic fields can be natural (the Earth and the Sun, for example, have their own EM fields), or they can be artificial. Artificial fields can be produced intentionally (microwaves use them to cook food, computers and phones use them to communicate), or they can be produced as a by-product of technology (pretty much anything that uses electricity will have an EM field).
Unlike particle radiation (which is generally ionizing), electromagnetic radiation can be either ionizing or non-ionizing. Radiation at non-ionizing frequencies may be sufficiently powerful to cause substances to heat up, but is not powerful enough to strip electrons from molecules (creating ions) and break molecular bonds.
The radio, microwave, infrared, and visible spectra are made up of non-ionizing radiation, while x-rays and gamma rays are forms of ionizing radiation, and ultraviolet radiation sort of straddles the line between the two.
High doses of non-ionizing radiation are known to cause thermal effects (think of putting your hand on an incandescent light bulb, or microwaving a pizza pocket), but low doses are not known to have any deleterious effects to living things. By contrast, high doses of ionizing radiation can result in serious burns and radiation sickness, while low, steady doses can result in genetic damage and cancerous tumours.
So that’s generally what scientific investigations into radiation has found: ionizing radiation causes direct damage to living systems, and non-ionizing radiation doesn’t (although it can heat stuff up). So what’s electromagnetic hypersensitivity?
Electromagnetic hypersensitivity (or EHS) is a term used to describe the adverse, subjective medical symptoms that some people report experiencing after exposure to certain frequencies of non-ionizing electromagnetic radiation (generally, the weak fields produced by WiFi hotspots, cell phones, or power lines). The symptoms associated vary from patient to patient, but often include fatigue, inability to sleep, headache, stress, muscle aches, and rashes. Sufferers report that their symptoms are worse in the city than in the country, and that they’re especially bad when they’re in close proximity to a device (such as a mobile phone) that emits a wireless signal.
Determining the prevalence of EHS is difficult, and estimates vary wildly depending on who’s asking the questions, with the World Health Organization reporting a few individuals per million, while surveys conducted by support groups peg the number as high as one in thirty. But the effects of this syndrome are not limited to those who describe themselves as hypersensitive. Because these symptoms can compromise quality of life, parents groups and teachers unions in Ontario and British Columbia are pressuring schools to remove all WiFi installations (with some success), a group called Citizens for Safe Technology is calling for BC Hydro to suspend its Smart Meter program, and according to news reports some sufferers taken to the hills, moving as far beyond the reach of cellular signals and power lines as they can.
So what’s the deal? Are these symptoms real or is it “all in their heads”?
First of all: What I just did? Don’t do that. While psychogenic illnesses certainly do exist (and we would do ourselves a great disservice to deny that), framing the issue in terms of diseases that are “real” or “all in your head” is, at best, unhelpful, not to mention wildly inaccurate.
So, let’s try that again: Are these symptoms really caused by a sensitivity to electromagnetic fields, or is something else going on?
Well, in 2004 the World Health Organization held a workshop on electromagnetic hypersensitivity. The working group proposed that we should no longer refer to “EHS”, because “electromagnetic hypersensitivity” implies a causal relationship between the reported symptoms and electromagnetic fields, and that relationship hasn’t been established. Because the actual cause of these symptoms isn’t known to be EMF, the WHO suggested that the syndrome be referred to as “idiopathic environmental intolerance attributed to electromagnetic fields” (or IEI-EMF) instead. Catchy, isn’t it?
So that’s where things stood in 2004: causality hadn’t been established, and many scientists were skeptical, as there was no known mechanism by which non-ionizing radiation could result in these symptoms. How have things progressed since then?
Well, there’s been a fair amount of research: some of it good, some of it not so good. The highest quality papers that we were able to identify involved double-blind, controlled provocation studies in which individuals who identified themselves as “hypersensitive” were exposed either to a source of EMF or to an inactive control. Subjects were asked to report on the severity of their symptoms, which allowed researchers to determine whether symptoms differed depending on whether the source of electromagnetic radiation was turned “on” or “off”. While subjects reportedly experienced symptoms of EHS while in the presence of the device, researchers were able to find no consistent correlation between symptom severity and the presence or absence of electromagnetic fields. In addition, while many hypersensitive individuals claimed to be able to perceive the presence of EMF, it turned out that the majority were unable to do so under double-blind laboratory conditions. Is it just me, or does this remind anyone else of the JREF’s million-dollar challenge?
While these and similar studies have fared well in replication and peer review, studies do exist purporting to show that EHS symptoms are correlated to EMF. However, they tend to exhibit basic methodological problems not present in the provocation trials. The body of the literature suggests that the symptoms of EHS are not caused by exposure to EMF, and several systematic reviews, including those published by Röosli in 2008 and Rubin et al. in 2010, concluded that the nocebo effect (the placebo effect’s evil twin) played a significant role in the onset of EHS symptoms.
A 2006 study investigating several treatments for EHS symptoms, including “shielding” devices, “filters”, supplementation, cognitive behavioural therapy, and even acupuncture, found that only cognitive behavioural therapy outperformed placebo. The body of available evidence suggests that electromagnetic hypersensitivity is a psychogenic disorder. EHS is frequently compared to other controversial idiopathic conditions such as chronic Lyme disease.
Rather than addressing the methodological problems identified in their research or investigating plausible alternative causes of EHS, activists in Canada have generally focused on limiting access to WiFi, Smart Meters, and other devices that they claim (without evidence) to be the cause of EHS. One of the most prominent promoters of the link between EHS and EMF in Canada is Dr. Magda Havas, who teaches environmental studies at Trent University. She’s published many papers on the subject, including one that claims to show that EMF (somehow) increases blood sugar. Dr. Steven Novella points out that this particular paper is actually nothing more than a four-patient case study (a series of well-documented anecdotes). Additionally, exposure to EMF was often guessed-at instead of measured, and no blinding was employed at all.
Another Havas study (which apparently did not pass peer review) purported to show that use of cordless phones resulted in huge spikes in heart-rate on an EKG; however, when Lorne Trottier and Harvey Kofsky investigated, they were able to replicate the spike on the EKG when it wasn’t even hooked up to a patient! The best explanation seems to be that the EKG was experiencing electrical interference from the cordless phone—something that is specifically warned about in the heart rate monitor’s user manual.
Okay, enough about EMF. Don’t cell phones and WiFi cause cancer? I remember reading about something about the WHO classifying cell phones as a carcinogen a few years ago, don’t I?
No. Well, that’s not actually true. The International Agency for Research on Cancer has classified radiofrequency electromagnetic fields in Group 2B, which means that they are “possibly carcinogenic”. While this puts radio waves in the same category as DDT, it also puts them in the same category as coffee, pickles, and “being a carpenter”. It’s worth pointing out that beer, wine, and other alcoholic beverages actually fall under group 1 (the “definitely known to be carcinogenic” group).
There’s a lot of nuance here, but I’ll try to break it down. First of all, the categories aren’t divided up by how carcinogenic we think they are; they’re divided up by how sure we are that they’re at least a little carcinogenic. If we’re quite positive that they’re a little bit carcinogenic (like alcohol), they go in Group 1. If the evidence shows that something is probably carcinogenic, it goes in Group 2A. If the evidence is quite muddled (as is the case with radiofrequency EMF), regardless of how carcinogenic we think it might be, it goes in Group 2B. So saying that cell phones are in the same category as DDT (or carpentry) can be misleading. It has nothing to do with how dangerous we think it might be, it has to do with how sure we are that it might be dangerous (in this case, not sure at all). Several large, randomized, controlled trials have found no link between cell phone use and cancer, while others have found a correlation. I don’t have time to delve deep into the details today, but so far I’m not convinced.
Several companies market products aimed at “protecting” customers from the putative harmful effects of EMF, including “Stetzer” filters and cellphone cases designed to block electromagnetic radiation. These devices offer no demonstrated health benefit, and as for the cases, to the degree that they may indeed block EM radiation, they would also interfere with the functioning of your device: that “radiation” is how mobile phones work. But that won’t stop companies from making a quick buck at the consumer’s expense.
I want to talk specifically about Smart Meters for just a moment. Is anyone familiar with these? They record your electricity usage, like any other meter, but they report readings back to the utility automatically. The thing is, they do so wirelessly, which is apparently the chief cause for concern, and the data that they gather is much more temporally specific, opening the door for pricing that differs by time of day or season. I want to point out that there are potential concerns related to these devices that do not relate to health. I think that making this distinction is important, and it’s one I harp on quite a bit whenever I’m asked to talk about genetically engineered foodstuffs. Whether or not I sympathize with criticisms of Smart Meters that relate to privacy, market forces, or information security, I want to stress that using bad arguments (like EHS) to support a potentially just conclusion is intellectually dishonest, and it’s a good way to alienate potential allies, particularly if those people take critical thinking seriously.
It’s important to point out that, given the balance of the available evidence, removing sources of EMF (such as WiFi or Smart Meters) is very unlikely to have any effect on those suffering from this EHS. Not only will these efforts inconvenience many people and incur substantial monetary costs, they’re not actually going to get us any closer to helping anyone. And that, in my mind, is the biggest problem.
The WHO released a fact sheet on the subject of electromagnetic fields and health. I’ll quote their conclusions here:
“The symptoms [of EHS] are certainly real and can vary widely in their severity. Whatever its cause, EHS can be a disabling problem for the affected individual. EHS has no clear diagnostic criteria and there is no scientific basis to link EHS symptoms to EMF exposure. Further, EHS is not a medical diagnosis, nor is it clear that it represents a single medical problem.”
To physicians, they further recommend: “Treatment of affected individuals should focus on the health symptoms and the clinical picture, and not on the person’s perceived need for reducing or eliminating EMF in the workplace or home.”
So, cell phones and WiFi: Should you be worried? I’m not.
Thanks to Catrina Duffy, Adrian Powell, Ryan Gray, and Jason Locklin, who joined me in spending countless hours poring through the literature on this project.
Links and References
Bad Science Watch
BSW Position Paper on Electromagnetic Hypersensitivity
Skeptic North: Why, WiFi? Why?
Science-Based Medicine: CFLs, Dirty Electricity and Bad Science
IARC Agent Classification Monographs