Why Are Peanut Allergies on the Rise?

Typically, the immune system treats peanuts as safe, but some scientists believe that early and heavy exposure to peanutladen products might cause the immune system to misidentify them as dangerous. This theory is strengthened by the fact that 8 out of 10 allergic kids have a reaction the first time they eat a peanut, indicating a previous indirect exposure, possibly even in the womb or through breast milk. Theories about peanut allergies abound and most involve an overactive immune system. “We have done such a good job of eliminating the threats that the immune system is supposed to manage that it’s looking for something to do,” says Anne Muñoz-Furlong, former CEO of the nonprofit Food Allergy and Anaphylaxis Network. Parents today feed their kids a lot of ready-made snacks, many of which contain peanuts or their derivatives.

“We’re bombarding the immune system with these [food-based] allergens, so it’s attacking those instead.” Indeed, food allergies in general are on the rise. But peanuts seem to trigger especially violent immune reactions. This might be because they contain several proteins not found in most other foods, posits Robert Wood, an allergy specialist at Johns Hopkins University, and the structure of these proteins can stimulate a strong immune response. Research suggests that roasting peanuts, as American companies do, might alter the proteins’ shape, making them an even bigger target. Allergy rates are lower in China, where it’s customary to boil peanuts, which damages the proteins less. (It’s worth noting, though, that China is also more polluted, so people’s immune systems might be concentrating on traditional threats.) Or maybe it’s all the time indoors. Children who spend little time outdoors tend to be deficient in D, Wood says, so their bodies might mislabel peanut proteins as dangerous. Parents looking to protect their kids might consider sending them outside—and not washing their hands when they come home.

Comments

What Causes Volcanic Lightning?

On March 10, 2010, Eyjafjallajökull volcano, a caldera in Iceland covered by an ice cap, erupted. It sent plumes of clouds across most of Europe and the Atlantic Ocean. Photos of the eruption show lightning originating and ending in the cloud of ash that hovered over the volcanic opening. The largest volcanic storms are similar to supercell thunderstorms that spread across the American Midwest. But while those thunderstorms are fairly well understood, volcanic lightning still remains mysterious. The remote location of volcanoes and infrequent eruptions make volcanic lightning difficult to study. In general, lightning occurs through the separation of positively and negatively charged particles. Differences in the aerodynamics of the particles separate the positive and negative. When the difference in charge is great, electrons flow between the positive and negative regions. A lightning bolt is a natural way of correcting the charge distributi...

Will Disease Drive Us All to Extinction ?

Virulent infectious diseases and parasites have long been shown to be a significant cause of decline in biological populations. But can disease lead to the actual extinction of the host species—such as humankind? Scientists attempt to determine the extinction-threatening effects of disease by first studying its role in historical extinctions. But proving that infectious disease is responsible for past extinctions is tricky business. After all, the extinct species is not around for scientific investigation. Even if a pathogen or parasite were discovered in a disappearing population, it would not prove that the pathogen itself was responsible for the decline. However, reasonable evidence exists that historical extinctions and extirpations—local extinctions in which a speciesc eases to exist in the specific geographic area of study—are at least partlya ttributable to infectious disease. Avian malaria and bird pox are believe...

Is the Y Chromosome Doomed?

Humans store their genes in 23 pairs of chromosomes, 22 of which are identically matched. The 23rd is a two-sided biological coin—twin Xs mean you’re female; an X and a Y, male. Chromosome pairs often trade bits of DNA in a process called recombination, the purpose of which is to keep genes functioning properly. Talk of men’s path toward extinction began in the late 1990s, when it was discovered that the human Y chromosome, which is stumpy compared with the X, does not share enough genetic material with the X to practice recombination. Left without a way to renew damaged genes, the Y would continue to degrade and would eventually disappear, geneticists announced. They slapped an expiration date on the male half of the species of sometime in the next 5 to 10 million years. To get a perspective on this prediction, scientists looked to our closest genetic relatives—the chimps. Because humans and chimpanzees shared a common ancestor 6 million years ago, genet...

knowledge

Search This Blog