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  • With its stimulating effects, it's easy to understand why coffee is the second most traded commodity on Earth after oil.

    その刺激的な効果のおかげで、なぜコーヒーが石油に次いで地球上で 2 番目に取引されている商品であるかを理解するのは簡単です。

  • For many, it keeps us awake and moving through our busy days.


  • 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.


  • 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 its way through your bloodstream and into your brain.


  • Where it starts to compete and bind with adenosine receptors.


  • But because it is 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.


  • It also means that when you try to quit drinking coffee or miss your daily intake, you might experience some withdrawal 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.


  • 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.


  • So can you drink too much coffee?


  • It turns out there is a lethal dose of caffeine which is somewhere around 150 mg of caffeine per kilogram of our body.

    体 1 kg につき約 150 mg のカフェインが致死量があることが判明しました。

  • This means if you weigh 70kg, you would require 14,000 mg of caffeine to overdose.

    つまり、70 kg の場合は、14,000 mg のカフェインを過剰摂取する必要があるということです。

  • 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.

    大局的にとらえると、平均的なコーヒー 1 杯には約 150 mg のカフェインが含まれています。体重が 70 kg の場合は、約 70 杯のコーヒーを飲むと死んでしまうということです。

  • 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.


  • You'd also start experiencing mania and hallucinations before getting to this point.


  • Caffeine also has a half life of around 6 hours.

    また、カフェインの半減期は約 6 時間です。

  • So if you drank a standard coffee with around 150mg of caffeine, after about 6 hours there will only be 75 mg left in your system and you'll be feeling half of the effect.

    約 150 mgのカフェインを含む標準的なコーヒーを飲んだ場合、約 6 時間後には 75 mgしか体内に残らず、感じる効果は半分になります。

  • And 6 hours after that, you'll have 37.5 mg, leaving more room for adenosine to jump back into action.

    6 時間後には 37.5 mgとなり、アデノシンの作用が戻る余裕ができます。

  • Which is why you may reach for another cup throughout the day.

    だからこそ、一日中もう 1 杯飲もうとしてもいいのです。

  • To maintain that glorious, alert and energetic feeling.


  • So drink up! And enjoy the buzz while it lasts!


  • And for all of you in school, while we know caffeine is key, so are good deals on textbooks!


  • So we've teamed up with to get you the cheapest prices for the books you need.

    私達は と提携して、皆さんが必要とする書籍の最安値を提供します。

  • All you have to do is head to and search the ISBN number of the books you're looking for. にアクセスして、お探しの本の ISBN 番号を検索するだけです。

  • SlugBooks will then compare prices from all across the net. Seriously, we know how expensive textbooks can be, so hopefully this will save you some money!

    SlugBooks はネット上のすべての価格を比較します。真面目な話、教科書がどれだけ高価になりうるか私達は知っているので、これによってお金を節約できることを願っています。

  • Got a burning question you want it answered? Ask it in the comments or on Facebook and Twitter. And subscribe for more weekly science videos!

    答えが知りたい疑問はありますか?コメント欄や Facebook でご質問ください。チャンネル登録をして、科学の動画を毎週お楽しみください。

With its stimulating effects, it's easy to understand why coffee is the second most traded commodity on Earth after oil.

その刺激的な効果のおかげで、なぜコーヒーが石油に次いで地球上で 2 番目に取引されている商品であるかを理解するのは簡単です。


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B2 中上級 日本語 アデノシン カフェイン コーヒー mg 飲む ドーパミン

コーヒーの上のあなたの脳 (Your Brain On Coffee)

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    朱朱 に公開 2021 年 01 月 14 日