Drinking coffee is good for your health, is it really confirmed this time?

For many people, coffee

It has a refreshing effect.

But some people say that drinking coffee is excessive consumption.

Overdrawing your body is harmful to your health.

Is this true?

Then let’s understand it together first

How does coffee make people feel less sleepy?

Then how to drink coffee properly?

Coffee can have such a miraculous effect, relying on caffeine,

This is a natural insecticide found in some plants.

Plants can't run away when they encounter danger.

So in the process of evolution, some defense mechanisms were selected.

Purine alkaloids, to which caffeine belongs, are one of them.

It can paralyze the nerves of insects, thus preventing them from being eaten.

If you encounter some greedy people, you can even poison them to death.

But don't be afraid.

Although there are individual differences,

It is generally believed that if caffeine is to be fatal, it would take 10 grams to be fatal.

It's pure.

If you try to achieve this by drinking coffee, the water will fill you up.

Therefore, talking about toxicity without considering the dosage is deceptive.

And the current mainstream scientific view is that

Drinking coffee in moderation every day is beneficial.

Be mindful that there are benefits rather than risks.

Of course you have to take it in moderation.

U.S. Food and Drug Administration (FDA)

The safety standard given is to consume no more than 400 mg per day.

Two large cups of Americano,

Drinking too much may lead to dependence.

Addiction is not fun.

Speaking of addiction,

Let’s first explain how caffeine makes people feel less sleepy.

Simply put, its refreshing method is a different approach.

Not by stimulation, but by "blocking".

We feel sleepy and tired,

It is inseparable from a substance called adenosine.

It is an inhibitory neurotransmitter.

It promotes sleep .

When our physical strength and energy are almost exhausted,

Adenosine binds to adenosine receptors.

Some hormones, like adrenaline, slow down secretion.

When brain activity decreases, you will feel tired and sleepy.

Coincidentally, the structure of caffeine is very similar to adenosine.

If you have had coffee at this time,

Caffeine will muddy the waters.

Quietly holding hands with adenosine receptors,

It has taken up the space of adenosine.

Blocks the binding of adenosine to adenosine receptors.

It's a bit like I blocked the keyhole,

Although I can't open the door, your original key is also useless.

In this way,

The brain cannot receive the signal that the body is tired and needs rest.

Various hormones continue to be secreted, neurons continue to be active,

Naturally, you can continue to have fun.

Of course, some people said that drinking it didn't work.

It is true that there are genetic differences between people.

It is also closely related to the time of drinking coffee.

If you want to get the best effect from your coffee,

I'm afraid I have to drink it a little earlier.

This is easy to understand.

When I'm particularly tired,

Adenosine and adenosine receptors have already joined hands,

There's no place for caffeine.

Naturally it will be of no use.

But don’t go too far in advance.

The average half-life of caffeine metabolism in the human body is 5 hours .

That is to say, after 5 hours,

There is still half of the caffeine that has not been metabolized.

So you know when you are most likely to feel sleepy.

You can drink it 3 or 4 hours in advance.

(Copyrighted image from the gallery, no permission to reprint)

Although coffee has a refreshing effect,

But it's not omnipotent.

A research team once evaluated and found that

Caffeine can only partially relieve the drowsiness caused by lack of sleep.

But it will still be affected in high-level difficulty tasks.

Examples include surgery and driving.

Therefore, the most important thing is to have a good rest.

Need enough sleep.

Let's go back to the adenosine receptors.

When caffeine occupies the receptor site,

Adenosine didn't leave.

They still surround the neurons.

Once caffeine is metabolized, it is quickly replenished.

At this time, people will feel sleepier and more tired.

This is also called a "caffeine crash."

If you don't sleep at this time, you won't be able to recover.

After all, we're talking about caffeine here.

Specifically, drinking coffee,

If you like to add sugar, milk, nuts and desserts,

Then you should pay more attention to the calories!

Source: China Digital Science and Technology Museum