From Abracadabra to Zombies
is a commentary on
mass media treatment of issues concerning science, the
paranormal, and the supernatural.
Skeptimedia replaces Mass Media Funk and Mass Media Bunk. Those blogs are now archived.
Immune system quackery
The threat of imminent immune system collapse is the calling card of quackery. - William Meller, MD
15 Jan 2010. In my review of Evolution Rx by Dr. William Meller, I praised and criticized the author. One of the praiseworthy aspects of the book is the way Meller debunks the many myths dispensed by so-called "alternative" healers. One of the more popular myths has to do with the immune system. As Meller notes, there seems to be an endless array of products, postures, and therapies claiming to boost or stimulate the immune system. Allegedly, stimulating the immune system will "fend off infection, cancer, and even old age." Sounds good, but it's nonsense.
Our immune systems very rarely break down, except when we starve, undergo intensive chemotherapy, or face an immune-system assassin such as HIV. These are life-threatening emergencies, not occasions to take an alleged immune "stimulant."
....Rather than being weak, it is far more common today that our immune system is overactive.
What is the immune system? Meller calls it "the body's homeland security." The immune system is a system of cells and proteins that are "scattered throughout the body — in the blood, lymph nodes, bone marrow, spleen, and even appendix." It's "made up of white blood cells and the tissues that make and harbor them." Immune cells try to protect the body from foreign invasions by such things as germs. Immune cells attack and dispense with the offenders. The security forces created by the immune defense system are called antibodies, "highly specific proteins programmed to recognize and remember a specific virus or bacteria forever." Yes, forever.
Our immune system never rests. In the mouth and gut it neutralizes germs that hitchhike in on food. In the lungs it screens the air we breathe. In the skin it wards off invaders trying to enter through dirty cuts and scrapes. The fact that we get so few infections, despite countless daily exposures, testifies to the vigilance of our immune forces.
One of the ways that our overactive immune systems can cause trouble is to attack things that aren't really a threat, such as plant pollen or animal dander. We call such attacks allergies, the focus of chapter 3 of Meller's book.
"An allergy is an overactive immune response to common substances, such as a bee sting, pet dander, or pollen. Some foods and medicines can also trigger allergies." According to Meller, most people who think they have food allergies actually suffer from food intolerance and do not involve the immune system at all. Fewer than 5% of Americans have food allergies, although 30% think they are allergic to some food or other. What's the difference between a food allergy and an intolerance? As noted, the former involves an overactive immune system; the latter isn't immune related.
The immune system doesn't forget. If you're allergic to something, the antibodies that were created by your immune system to attack what it responded to as a threat will always be activated when the allergen is present. "Once you are allergic to something, you will always be allergic to it." Also, allergy symptoms are limited: "red and itchy eyes, stuffy nose, sneezing and wheezing, hives, very rarely swelling of the intestinal lining." Unfortunately, many of these symptom are also the symptoms of a common cold. "The point of most of these symptoms is to try to expel the offending allergens from the body by crying, sneezing, coughing, or flushing it out." Other symptoms of allergies include itchy mouth, lowered blood pressure, faintness, a tightening throat, and trouble breathing.
How do you know if you have an allergy? "If you react rapidly and predictably every time you come in contact with a substance," then you are allergic to the substance. If your reaction to a substance takes an hour or more, you're probably dealing with an intolerance. Also, "most allergy symptoms will be at least partially relieved by antihistamines." The symptoms of food intolerances — such as gas, vomiting, bloating, and cramps — will not respond to antihistamines. Food intolerance symptoms are often dose-related: the more you eat, the worse you feel.
You might try getting tested for allergies, but if the test is negative, you might still have an allergy. If it's positive, there may still be many things you're allergic to but don't know about. There are millions of things you could be allergic to, but common allergy tests check for fewer than 100 allergens.
In Meller's view, food allergies are rare and, in most cases, "are a careless fad diagnosis, spread through word of mouth and the media...." On the other hand, "respiratory and skin allergies [such as asthma and eczema] have greatly increased in the developed world over the past century," as have autoimmune diseases such as rheumatoid arthritis, lupus, multiple sclerosis, scleroderma, Crohn's disease, celiac disease, Grave's disease, and type 1 diabetes. According to the Center for Disease Control (CDC), 5-8 percent of the US population have an autoimmune disorder and 78.8 percent of them are women. Meller doesn't discuss the sex disparity in immune responses. He tries to explain the rise in respiratory and skin allergies, and the rise in autoimmune disorders in terms of differences between our way of living and the way of living of our Stone Age ancestors. I think it's apparent, however, that hormonal differences are going to be more important than the fact that we live in a cleaner world than Stone Age people, one free of worms and parasites, in trying to explain this fundamental difference between men and women.
Finally, Meller's advice to breast feed as the best defense against allergies seems sound, from what I've read elsewhere. But I don't know what to make of Meller's advice to feed infants small amounts of potential allergens to avoid allergies later, and expose our children to dirt, flowers, trees, and animals as a way of protecting them from later immune attacks. Some researchers, for example, think that overexposure to allergens is responsible for the increase in allergies. Unlike Meller, some think the increase in allergies is due to our world being dirtier and more polluted, not cleaner and more antiseptic, than the world of our ancestors.
new I Can’t Eat That. I’m Allergic by Gina Kolata Doctors are diagnosing allergies where none exist and people are assuming that they have allergies when they do not....The word “allergy,” Dr. Glassner said, has come to connote any unpleasant experience with food. But unlike true allergies, which can kill, food intolerances are just uncomfortable. (Barry Glassner is a sociology professor at the University of Southern California and the author of The Gospel of Food: Everything You Think You Know About Food Is Wrong. )
* AmeriCares *