Are Microwave Ovens Safe?
An examination of the various claims that microwaved food and water are poisonous.
Filed under Health, Urban Legends
| Skeptoid #80 December 25, 2007 Podcast transcript | Listen | Subscribe |
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Today we're going to walk on the wild side and eat some microwaved food. You've never really lived until you've lived dangerously, so let's put our lives on the line by testing the claims that microwaved food and water are toxic.
First, a little background info. Microwave ovens work by passing microwave-band electromagnetic radiation over the food at 2.5 GHz. Molecules that are electric dipoles, of which water is the most efficient, rotate back and forth in this field. The friction between them creates heat. This is called dielectric heating. More complex molecules, which are not as clearly dipolar, are not affected. It's an efficient and clean way to heat food.
I first learned about the claims of danger from a chain email sent by a friend of mine who tends to believe anything that's anti-establishment or on the fringe. A few Internet searches of some keywords reveal a huge number of holistic, organic, and other alternative web sites repeating these same claims. Just to give you a flavor of how far-out these stories are, give a listen to this list of "Ten Reasons to Throw Out Your Microwave Oven". As I read these off, notice that not one of them makes a specific or testable claim; they are all merely scary sentences constructed using scientific sounding words. And, as you can tell from the brief description of how microwaves work, few of these have any remote connection to fact:
- Continually eating food processed from a microwave oven causes long term — permanent — brain damage by "shorting out" electrical impulses in the brain, de-polarizing or de-magnetizing the brain tissue.
- The human body cannot metabolize the unknown byproducts created in microwaved food.
- Male and female hormone production is shut down and/or altered by continually eating microwaved foods.
- The effects of microwaved food by-products are permanent within the human body.
- Minerals, vitamins, and nutrients of all microwaved food is reduced or altered so that the human body gets little or no benefit, or the human body absorbs altered compounds that cannot be broken down.
- The minerals in vegetables are altered into cancerous free radicals when cooked in microwave ovens.
- Microwaved foods cause stomach and intestinal cancer tumors. This may explain the rapidly increased rate of colon cancer in America.
- The prolonged eating of microwaved foods causes cancerous cells to increase in human blood.
- Continual ingestion of microwaved food causes immune system deficiencies through lymph gland and blood serum alterations.
- Eating microwaved food causes loss of memory, concentration, emotional instability, and a decrease of intelligence.
One clue that might encourage you to regard these claims with some skepticism is that fact that ever since microwave ovens came on the market in 1954, not one person has ever exhibited a single symptom of any illness resulting from having eaten microwaved food, or from having used water that had been microwaved. Burns are the exception, but burns are caused by heat from any source; that's not unique to microwaves. But if you believe the claims by the anti-microwave fringe, whom I call the Microwave Militia, practically everyone on the planet should be gravely ill with cancer, radiation poisoning, malnutrition, and mental retardation.
The same chain email, and many of these web sites, also state that giving a plant water that has been microwaved will kill it. There is even a series of unsourced photographs of two plants, one of which withers and dies while its sibling flourishes. The awesome web site Snopes.com tested this particular claim. They took three plants of each of several types, and watered one with tap water, one with water that had been boiled over a stove, and the third with water that had been boiled in a microwave. Unlike whoever took the pictures that often accompany the chain email, Snopes actually controlled for other variables. I'm sure you won't have to stretch your imagination very far to guess how the plants did. They all did exactly the same. Snopes has complete details and photographs on their web site. Somehow these plants managed to escape the guaranteed death sentence that believers say microwaved water carries.
This whole paranoid suggestion is based on the presumption that a microwave oven somehow changes or poisons water. If true, wouldn't you be able to perform some kind of a test on water, and see if it has ever been microwaved? Water is H2O, whether it's ever been microwaved or not. But here's an even deal for you. If you truly believe that H2O carries some permanent damage as a result of being microwaved, and that it's possible to detect this damage through any means you choose, there's a million dollars in it for you. As you may know, the Skeptoid podcast is a qualifying media outlet for the James Randi Educational Foundation's Million Dollar Paranormal Challenge. I'll walk it through for you and I'll become your biggest cheerleader. Are microwaves really a danger to humanity? If so, it would be immoral for you to do anything else but take that million dollars and use it to educate and save the world.
Probably the most flagrant error that the Microwave Militia propagates is that microwaved food or water contains what they call "radiolytic compounds" — new chemicals created by the tearing apart of molecules in a microwave. These new chemicals are said to be dangerous, cancerous, radioactive, unnatural, or otherwise harmful. This is a demonstrably false claim. Radiolysis, which is a real process and which the Militia believes creates these radiolytic compounds, is the process by which molecules are dissociated under ionizing radiation. Water can be dissociated under ionizing alpha particle bombardment, which is a natural process. Microwave radiation, as mentioned earlier, is not ionizing radiation. It is thus scientifically incapable of causing radiolysis. The differences between microwave radiation and alpha radiation are huge. With the claim that microwaves cause dissociation of water molecules, the Microwave Militia is either deliberately lying, or they are grossly ignorant of the very subject on which they claim superior expertise.
Swiss vegetarianism advocate Dr. Hans Hertel is perhaps the most vocal of the Microwave Militia fringe group. He is quoted in virtually every book written on alternative foods or holistic health. A top-selling book on Amazon called Perfect Balance, by an author known simply as "Atreya", writes:
In spite of the political pressure, Hertel has continued his studies and won the support of many other scientists in Europe for his findings and methodology. Hertel concludes that microwaved food alters the blood chemistry of people who eat it. The manufacturing companies are trying to keep this information suppressed through court orders.
Dr. Hertel seems to have managed to gain this claimed following even without producing the most basic of information that prospective groupies should request: a specific, testable claim about what this change in blood chemistry might be; or a single victim. He is best known for his most publicized test. In 1989, he and seven fellow vegetarians confined themselves to a hotel and consumed only milk and vegetables, prepared in different ways, for two months. When he emerged, he announced his results: That microwave ovens cause cancer and degenerative diseases, despite no cases of cancer or illness among he or his group. His research, if you want to call it that, was never peer reviewed or published in any reputable journal, and yet it has become the foundational magnum opus of the anti-microwave agenda.
You'll also find that there are a large number of studies out finding changes to the nutritional content of food that has been microwaved, and the Microwave Militia loves to point to these. Chemical reactions happen whenever any food is cooked, so this has more to do with cooking than with the cooking method. Moreover, such changes are generally well below any perceptible threshold, and have always been found to be safe.
The Microwave Militia also makes claims such as microwave ovens are illegal in Russia or other parts of Europe. This is just a straight-up lie. Microwaves are perfectly legal in Russia and everywhere else in Europe. In fact I was not able to find a single country in the world that bans microwave ovens. They're regulated, of course, like all electric appliances; but regulation should not be mischaracterized as a ban.
So what's the sum total of our evidence? Billions of people have been eating microwaved food for decades, with no ill effects, and no plausible expectation of ill effects. The best evidence put forward by anti-microwave activists is based on shameless lies and irresponsibly bad science. Thus, a truly skeptical process leads us to the conclusion that there's nothing at all wrong with microwaving your food. However, I'm drinking coffee right now made from microwaved water, and it's entirely possible that this has caused profound mental aberration, and made me spout nonsense.
You should follow me on twitter here.
© 2007 Skeptoid Media, Inc. Copyright information
References & Further Reading
Dr. Hans Hertel. NEXUS Magazine. Mapleton, Australia: Mercola, 1995. Volume 2, #25.
Kleinerman, R.A., Linet, M.S., Hatch, E.E., Tarone, R.E., Black, P.M., Selker, R.G., Shapiro, W.R., Fine, H.A., Inskip, P.D. "Self-reported electrical appliance use and risk of adult brain tumors." American Journal of Epidemiology. 15 Jan. 2005, Volume 161, Number 2: 136-146.
Latimer, Joan M,, Matsen, John M. "Microwave oven irradiation as a method for bacterial decontamination in a clinical microbiology laboratory." Journal of Clinical Microbiology. 1 Oct. 1977, Volume 6, Number 4: 340-342.
Mikkelson, Barbara, Mikkelson, David P. "Boiling Point." snopes.com: Microwaved Water - See What It Does to Plants. snopes.com, 22 Aug. 2006. Web. 5 Dec. 2009. <http://www.snopes.com/science/microwave/plants.asp>
Mudgett, R. "Electromagnetic energy and food processing." Journal of Microwave Power and Electromagnetic Energy. 1 Dec. 1988, Volume 23, Number 4: 225-230.
Welt, B. A., Tong, C. H. , Rossen, J. L., Lund, D. B. "Effect of microwave radiation on inactivation of Clostridium sporogenes (PA 3679) spores." Applied and Environmental Microbiology. 1 Feb. 1994, Volume 60, Number 2: 482-488.
Reference this article:
Dunning, Brian.
"Are Microwave Ovens Safe?" Skeptoid Podcast. Skeptoid Media, Inc.,
25 Dec 2007. Web.
2 Sep 2010. <http://skeptoid.com/episodes/4080>
Discuss!
5 most recent comments | Show all 36 comments
Remember, you should always read with skepticism the comments of anyone too lame to put their real name & city.
Russia banned microwave ovens - yes I'm sure they did, they banned blue jeans and colour televisions too. The Institute for Radio Technology in Kinsk has been closed for decades now and no-one but William Kopp (the instigator of this story) can find any evidence not also linked to blue jeans. The reasons are American, not Russian.
Norma Levitt, the unfortunate lady who died after a blood transfusion, died of a blood clot (see Warner v. Hillcrest Medical Center 1995 OK CIV APP 123, this was a subsequent case but mentions the original one). It is possible (probable) that the blood clot was caused by "cooked" blood, all to easy with the speed of microwave heating, but this was not tested in court.
Regarding the broccoli experiment, the control was steamed for 3.5 mins, the broccoli was microwaved for 5 mins, not really comparable given that the broccoli was being steamed and microwaved at the same time.
Roy from Ontario - your comment was very funny, until I realised that it would actually explain why the microwaved watered plants had died. Now I think it's serious, maybe they really did pour boiling water over the plants, no wonder they died.
Lastly, plastic containers. Yes, a lot of work has been done on these and yes, those that are not marked "microwave safe" (e.g. many take-away containers) may be potentially harmful.
Kiwi-Ian, New Zealand
June 16, 2010 7:46pm
If true, wouldn't you be able to perform some kind of a test on water, and see if it has ever been microwaved?
and that it's possible to detect this damage through any means you choose, there's a million dollars in it for you.
Dear Brian;
I am assuming that by measuring the dissolved gasses in boiled in a microwaved water and boiled in a saucepan water.
Not that it would have any health differences unless you were a fish.
Bruce, Australia
August 14, 2010 9:05pm
Which gasses released by microwave stimulation would be different from heat-stimulated boiling?
Tom H, Kent, UK
August 20, 2010 12:44pm
Don't put plastic wrap over your macaroni and microwave that. The steam created by the microwaves was found to leach dioxin from the plastic, and then drip back onto the food. ... While the list of reasons not to microwave is amusing, it's a straw dog. I'm curious to know about the purported experiments showing that animals fed exclusively on microwaved food did not thrive. I'll bookmark this page and await clarification.
Barton Spring, Austin, Tx
August 25, 2010 5:42pm
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Bob,
Microwave-safe plastic containers are designed to be more or less transparent to microwaves so that the waves are absorbed by the food inside, which heats up and by conduction heats the container.
The materials are tested before marketing.
http://www.mayoclinic.org/medical-edge-newspaper-2007/may-07.html
Brian likes the argument that no victim was identified, and used it with respect to water fluoridation and pesticides.
Max, Boston, MA
June 09, 2010 1:50am