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  • So if you found yourself staring down

  • a grizzly bear with the head of a great white shark and cobras for arms,

  • your body would start releasing adrenaline and norepinephrine within seconds

  • to prepare you to fightOr more likely, to take flight.

  • After a minute or two your body would be flooded with cortisol.

  • Cortisol is vital in keeping you healthy in tense situations.

  • But when you stay stressed for too long

  • it can have the opposite effect.

  • Cortisol's job is to restore some order to your body.

  • It puts more glucose into your bloodstream

  • so you don't crash when the adrenaline is gone.

  • It also kicks your liver into gear,

  • pumping out the extra glucose that's now sloshing around inside you.

  • Our bodies' hormone responses might have evolved when we were battling for survival against predators like bear-snake-sharks.

  • These days, sources of stress are much different:

  • dwindling bank accounts, overdue assignments, too much e-mail.

  • That kind of stress tends not to go away,

  • which means cortisol levels can stay elevated.

  • And that can lead to health problems.

  • Cortisol inhibits some of your immune responses,

  • meaning you're more likely to get sick and it can take longer for wounds to heal.

  • Cortisol also slows bone growth, meaning sustained levels can lead to weaker, more fragile bones.

  • And because cortisol acts on parts of your brain that control appetite,

  • it also increases your desire for fatty and sugary foods.

  • Stress eating is real, people!

  • Here's a weird plot twist for cortisol, though.

  • That lowered immune response can actually be beneficial.

  • In its medical form, cortisol is called hydrocortisone.

  • You may have applied it to a rash or a bug bite,

  • because it helps reduce swelling and itching

  • which is how our immune system responds to certain threats.

  • So at least you won't have to stress out about that weird rash, which you should probably get looked at. Seriously.

  • But before you do that.

  • Hit that subscribe button.

  • Want to beat stress?

  • Then eat healthy food, get exercise, get more sleep.

  • But definitely subscribe.

  • Thanks to CAS (Chemical Abstract Service) for sponsoring this video.

  • And hey, if youare really into molecules,

  • check out the Scifinder Future Leaders in Chemistry Program.

  • Ph.D. students and postdocs like me from around the world

  • are brought in to share their insights and go behind the scenes with Scifinder.

  • It's an all-expense-paid trip where you can get to see firsthand

  • how CAS builds and maintains the world most authoritative chemistry databases.

  • You'll also get to travel to the American Chemical Society's National Meeting Exposition.

  • For details, please visit CAS.ORG/FUTURELEADERS.

So if you found yourself staring down

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B2 US cortisol stress immune rash glucose adrenaline

Why Too Much Stress Is Bad For You

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    羅紹桀 posted on 2016/02/02
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