中級 12702 タグ追加 保存
動画の字幕をクリックしてすぐ単語の意味を調べられます!
単語帳読み込み中…
字幕の修正報告
Get your tissues ready, because spring has sprung!
- Hey guys, Tara here for Dnews - and it is
officially that time of year! The birds are chirping, the flowers are blooming, and if
you're anything like me - your nose is a disgusting faucet of neverending liquids.
BUT- before you go blaming pollen for those pesky seasonal allergies - remember, you have
no one to blame but yourself.
So, what's happening inside your body, when you experience allergies?
Well, it's basically one giant misunderstanding. The first time you're exposed to an allergen
- your immune system investigates that allergen and produces specific antibodies for it, which
are special cells designed to detect and stop foreign invasion.
Typically, this is a good thing. It's what prevents you from getting sick. But in the
case of allergies, your immune system mistakes innocuous things like pollen and cat dander
- for a serious threat. And in response to that threat, your plasma cells release a flood
of these antibodies that attach to the surface of your mast cells, causing them to burst
open and release a flood of histamine. Histamine is what causes the swelling that leads to
various allergy-like symptoms, like runny nose, sneezing, or hives.
But why do some people have such bad allergies, and others not at all? There's no cut-and-dry
answer to that question, but genetics and environment seem to play the two biggest roles.
Research, for example, has shown that children with one allergic parent have a 33% chance
of developing allergies; and with two allergic parents, that number goes up to 70%. Genetics
are also the reason African-American children experience three times as much sensitivity
to food allergens, as Caucasian children. In science, we're always taught that early
development is the most crucial stage of life - and early exposure to allergens is no different.
Research from Henry Ford Hospital shows that having a pet in the house during your child's
first year of life may protect him or her from developing allergies.
That same group also found that babies born via c-section were six times more likely to
be sensitive to dust mite allergens, than babies born via natural birth. Presumably,
because they're not exposed to the microbiome of bacteria present in the mother's birth
canal, which teaches their immune system the difference between good and bad bacteria.
This goes hand in hand with something called the Hygiene Hypothesis, which aims to explain
why allergies are more prevalent in wealthy, industrialized nations, than developing countries.
Again, the idea is that a lack of early exposure to parasites and bacteria typically found
in developing nations - prevents our bodies from being able to develop the appropriate
immune response to them. So in the event we're actually exposed to dangerous agents, our
bodies simply don't know how to deal with it.
So, what can we do about seasonal allergies, if our bodies just refuse to cooperate?
Anti-histamines can alleviate the symptoms - but they're not gonna make you any less
allergic to a substance you're already allergic to. Some studies tout alternative remedies
- like acupuncture, or eating locally grown honey - but most of those have anecdotal effects.
The only proven treatment for respiratory allergies - is immunotherapy, where you receive
increasing doses of whatever allergen you're sensitive to, either orally - or via injection.
That slow build-up of allergens, allows your body to acclimate to them, which in turn,
improves your long-term tolerance. Not only is this an expensive option - if
you don't have insurance - it's also a time-consuming process, that can take months or even years
to build up a sufficient tolerance. In the most extreme cases, people with severe
allergies can resort to rush immunotherapy - which is the same thing, but on a much tighter
timeline. So instead of spreading out your doses over several months or years, you receive
all of them. In a week. One long, miserable, neverending week.
Still better than a lifetime of sneezing, though - that much I can tell you. I got tested
for allergies my first year of college - and discovered I was allergic to all 71 allergens
they tested me for, including both American and German cockroaches. So, yeah. I'm pretty
wordly. I know there's weirder stuff out there, though
- so let us know what YOU'RE allergic to, in the comments down below - or hit us up
on Twitter at @Dnews.
コツ:単語をクリックしてすぐ意味を調べられます!

読み込み中…

Why Do We Get Allergies?

12702 タグ追加 保存
王健安 2016 年 7 月 23 日 に公開
お勧め動画
  1. 1. クリック一つで単語を検索

    右側のスプリクトの単語をクリックするだけで即座に意味が検索できます。

  2. 2. リピート機能

    クリックするだけで同じフレーズを何回もリピート可能!

  3. 3. ショートカット

    キーボードショートカットを使うことによって勉強の効率を上げることが出来ます。

  4. 4. 字幕の表示/非表示

    日・英のボタンをクリックすることで自由に字幕のオンオフを切り替えられます。

  5. 5. 動画をブログ等でシェア

    コードを貼り付けてVoiceTubeの動画再生プレーヤーをブログ等でシェアすることが出来ます!

  6. 6. 全画面再生

    左側の矢印をクリックすることで全画面で再生できるようになります。

  1. クイズ付き動画

    リスニングクイズに挑戦!

  1. クリックしてメモを表示

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔