Lý do đằng sau số ca dị ứng gia tăng

đến nay, nỗi ám ảnh về dị ứng thực phẩm của người Mỹ là một loại tiếng ồn trắng (white noise), một tiếng vang đều đặn ở rìa ý thức. 


...So why have our immune systems (hệ thống miễn dịch) suddenly gone haywire (dừng hoạt động)? One theory notes that we (mostly) eradicated hookworms (giun móc) by the 1980s in the United States. And roundworms (giun đũa). And tapeworms (sán dây). All the classic parasites (ký sinh trùng) are mostly kaput (bị xóa sổ). Without those actual threats, our immune system downshifts to tackle the biggest possible threat on the horizon. Which, these days, might be cashew butter or Camembert.
“It’s looking for stuff to do and it’s staying busy,” Warren said. “But it’s busy doing stupid stuff like reacting to walnuts and birch pollen (phấn hoa bạch dương).”

Some support for this theory comes from anecdotes (giai thoại) offered by experts who infected (nhiễm khuẩn) themselves with hookworms to distract their overactive immune systems. While this method achieved some success in curbing stubborn (cứng đầu) allergies and other conditions, it seems unlikely we’ll see a massive experiment anytime soon that randomly infects healthy Americans with hookworms. Still, this so-called hygiene (vệ sinh) hypothesis helps explain why allergies may be on the march: Back when they were more widespread, hookworms and their friends may actually have reined (kiềm chế) in our immune systems’ most aggressive tendencies.

from Andrew Van Dam.

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