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  • { ♪INTRO }

  • It's a belief almost as old as the product

  • it's about.

  • Back in Egypt in the 12th century, a royal physician

  • warned that dairy can make you stuffy

  • in the head.

  • No one seems to know where he got that idea from,

  • but it's become a common belief worldwide

  • that gulping down a glass of milk or a grilled cheese

  • will leave you with more mucus than

  • a tissue can hold.

  • But... there seems to be no scientific evidence to back up that claim.

  • The idea that milk worsens congestion is one

  • of the most prevalent and persistent medical beliefs.

  • And while it might seem like a silly thing

  • to worry about, if dairy does increase mucus

  • secretion in the respiratory tract,

  • it would not only make colds more annoying

  • it could be harmful to people with respiratory conditions

  • like asthma.

  • So far, only a few rigorous experimental scientific

  • studies have tried to determine if the milk-mucus

  • effect is real, and none have found support for the idea.

  • Several studies of asthmatics found that lung functioning

  • like how much air you can blow

  • out in one second

  • weren't affected by eating dairy.

  • And, in a study from the early '90s,

  • people who were infected with a common cold virus

  • didn't cough, sneeze or make any more nose gunk

  • if they drank milk.

  • That doesn't stop people from feeling like

  • they're more phlegmy after a tall glass

  • of 2%, though.

  • In a double-blind study published in the journal

  • Appetite in 1993, 169 participants said drinking

  • a flavored milk drink left a coating in their mouths,

  • and that after drinking it, they needed

  • to swallow more and their saliva was thicker.

  • The thing is, they said the same thing about

  • a soy placebo drink which did not contain

  • dairy.

  • And neither beverage significantly increased

  • the severity of mucus-related symptoms like

  • coughing or sneezing.

  • That could suggest the nocebo effect is at

  • playthe phenomenon where expecting something

  • bad to happen literally makes it happen.

  • Basically, the awful flipside of the placebo effect.

  • Or, it could be the fat in milk-like drinks

  • makes people's mouths feel a particular

  • way without actually changing mucus production.

  • You see milk is an emulsion

  • droplets of fat hanging in water

  • and saliva makes these

  • fatty drops clump together.

  • Globbier fat drops might feel a bit like mucus

  • or hang around in your mouth for longer,

  • making you think there's more mucus when there really isn't.

  • Though more research could really nail the coffin

  • shut on this idea, there's just no

  • evidence that dairy products actually cause

  • you to produce more mucus.

  • So go ahead!

  • Drink that milky boba tea, snack on that cheese stick,

  • whatever you wanna do, unless you've got

  • lactose intolerance or you're vegan or you

  • just hate cheese...I'm not in charge of your life.

  • Thanks for watching this episode of SciShow!

  • If you like learning about milk

  • and how it affects your body,

  • we've got more stuff for

  • you like our episode which explains

  • how people can drink milk as adults

  • something most animals do not do.

  • { ♪OUTRO }

{ ♪INTRO }

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B2 中高級 美國腔

牛奶会让你发霉吗?(Does Milk Make You Phlegmy?)

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    joey joey 發佈於 2021 年 05 月 06 日
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