百科知識視頻之煎蛋小學(xué)堂14 當(dāng)大腦“嗑”了咖啡

With it's stimulating effects,it's easy to undersand.why coffee is the second most traded commodity on Earth after oil.For many,it keeps us awake and moving through our busy days.

咖啡的刺激效果使我們?nèi)菀桌斫?，為何咖啡是僅次于油的世界第二大交易商品。它有助于保持清醒 幫我們挺過忙碌的日子。

But how does it work?What exactly does coffee do to your brain?Whenever you're awake,a chemical called adenosine slowly accumulates in your brain.And this adenosine binds to receptors which slow down brain activity-ultimately,the more adenosine there is,the more tired your brain feels.Which makes sense,as the longer you're awake,the more fatigued you become.

不過 它是怎么做到的?咖啡對大腦做了什么?當(dāng)你清醒時 腺甘酸會在大腦內(nèi)部逐漸積聚。腺甘酸會與減緩腦部活動的受體結(jié)合，最終 腺甘酸越多 你的大腦越累。這也有它的道理 清醒的時間越長 你也會越疲憊。

Conversely,while you sleep,the concentration of adenosine declines,gradually promoting wakefulness.But it turns out that the caffeine in your coffee is incredibly similar to adenosine in structure.The caffeine works it's way through your blookstream and into the brain.where it starts to compete and binds with adenosine receptors.

相反 當(dāng)你睡眠時 腺甘酸的濃度下降，逐漸使你清醒。不過 咖啡中的咖啡因在結(jié)構(gòu)上和腺甘酸很相似?？Х纫螂S著血液流動 進(jìn)入大腦，它在此參與競爭 與腺甘酸受體結(jié)合。

But because it's not adenosine,the"sleepiness" effect isn't felt.Adenosine can no longer bind,meaning it's calming properties are diminished.Which is great for you when you're feeling tired!However,with long term use of caffeine,your brain responds by creating more adenosine receptors-which means more caffeine is required to elicit the same response.

由于它本非腺甘酸 因此人不會有倦意。腺甘酸不再被結(jié)合 其鎮(zhèn)定作用就會減弱。當(dāng)你感覺疲憊時 這正合你意!但是 長期使用咖啡以后，你的大腦會因而產(chǎn)生更多的腺甘酸受體.

It also means that when you try to quit drinking coffee or miss your daily intake.you might experience some with drawal symptoms and feel more tired than you would have before you ever drank coffee!But the caffeine doesn't stop there!It also stimulates the production of adrenaline-you know,the Fight or Flight hormone?This increases your heart rate,gets your blood pumping and even opens up your airways.

這也說明 當(dāng)你想戒除咖啡或忘記喝時，就可能會經(jīng)歷某些斷癮癥狀，感覺比未開始喝咖啡前疲倦的多，不過 咖啡因的作用不止于此!它也會促進(jìn)腎上腺素分泌，對 就是“或打或逃”的荷爾蒙?它可導(dǎo)致心跳加速 血流加快，甚至使導(dǎo)氣管擴(kuò)張。

Furthermore,it affects Dopamine levels by preventing its reabsorption in the brain.which makes you feel happy!In fact this is the exact same thing that cocaine does,just to a lesser degree,it's a drug,after all!This dopamine stimulation is also the aspect of coffee that makes it moderately addictive.

此外 它也會通過阻止大腦重吸收多巴胺來影響其水平，使你更歡脫!其實(shí) 咖啡因也起著同樣的作用 只是程度較輕。畢竟 它還是藥物!多巴胺刺激也使咖啡具有一定的成癮性。

So can you drink too much coffee? It turns out there is a lethal dose of caffeine which is somewhere around 150mg of caffeine per kilogram of your body.This means if you weigh 70kg you would require 14,000mg of caffeine to overdose.Put into perspective an average cup of coffee contains roughly 150mg of caffeine.meaning if you are 70kg,approximately 70 cups of coffee would kill you.However,you'd have to drink those cups all at once. making it effectively impossible to overdose on caffeine from coffee.since you wouldn't be able to physically fit that much in your stomach.

那么 喝咖啡可能過量嗎?其實(shí) 咖啡因存在致死劑量，大約為每千克體重150毫克咖啡因。也就是說 如果你體重70千克 則需要14克咖啡因才會過量。形象點(diǎn)說 平均每杯咖啡含量有150毫克咖啡因。若你的體重為70千克 喝下70杯咖啡會致死。但是 你得一次喝下這么多咖啡，單單喝咖啡導(dǎo)致咖啡因過量幾乎不可能，因?yàn)槟愀緹o法將這么多東西裝進(jìn)胃里。

You'd also start experiencing mania and hallucinations before getting to this point.Caffeine also has a halflife of around 6 hours-so if you drank a standard coffee with around 150mg of caffeine,after about 6 hours there will only be 75mg left in your system and you'll be feeling half of he effect.

在過量前 你也會出現(xiàn)狂躁和幻覺?？Х鹊陌肱懦銎诩s為6小時，所以若你喝下的咖啡含有150毫克咖啡因，約6小時后 你的體內(nèi)只剩下75毫克咖啡因，你感受到的效果也會減半。

And 6 hours after that,you'll have 37.5mg-Leaving more room for adenosine to jump back into action.Which is why you may reach for another cup throughout the day to maintain that glorious,alert and energetic feeling.

再過6小時 體內(nèi)就僅有37.5毫克，使得腺甘酸有機(jī)可乘。這就是為何一天內(nèi) 你一杯接著一杯地喝。才能保持光彩 警覺 精力十足。

So drink up!And enjoy the buzz while it lasts:)

那么喝杯咖啡吧 在作用尚存時好好享受