Let's talk about the "heartbeat" feeling brought by milk tea today, regardless of what is high in sugar and calories.

This is caffeine and theophylline in milk tea.

Even if there is caffeine in coffee, how can there be caffeine in milk tea?

It's true. The raw materials of milk tea are tea leaves, which contain theophylline and caffeine.

Although the name doesn't sound like it, theophylline and caffeine are two good friends and look alike. Under the biological and chemical effects, it is easy to undergo reversible changes. Just like the black tea and oolong tea we often drink, the caffeine content is relatively high.

Caffeine contained in a cup of milk tea may not be lost to coffee. Nanjing Municipal Bureau of Market Supervision once published an analysis report on the results of special sampling inspection of online celebrity milk tea, and all the samples were 1, CoCo cocoa, milk snow tea and so on. The test results show that caffeine is everywhere, and the highest content in one cup is equivalent to 3 cups of American coffee or 6 cans of Red Bull.

In addition to caffeine, too much theophylline can easily lead to "tea drunkenness", that is, some people who usually drink strong tea or drink less tea on an empty stomach feel unwell after drinking tea, such as palpitation, trembling, dizziness, weakness of limbs, stomach discomfort, vomiting, hunger and so on.

It is not difficult to know why some people react so much after drinking milk tea.

In fact, caffeine can also increase dopamine levels through more complex neural mechanisms. With the increase of dopamine level, users will feel agile and excited. Speaking of this kind of dopamine, Xiao Jiu also said before that when people are in love, the cerebral cortex will secrete this substance, so if you feel excited and fall in love, it is not unreasonable.

2 Excited, will it be addictive?

While some people are worried about the excitement brought by caffeine, some people will feel energetic and even improve their work efficiency.

Although caffeine can bring some "reactions", it is actually a good thing.

Caffeine can not only clear your head. It can also accelerate human metabolism and improve oxygen delivery capacity. It can also be used as medicine, which can tighten the blood vessels in the brain and reduce the blood flow in the brain, and can be used as a "specific medicine" to relieve headaches. Even taking a small dose at a time can produce positive psychological effects, such as increased heart rate and elevated blood pressure.

There are also some studies that caffeine is beneficial to the prevention of type II diabetes, and also has a miraculous effect on the prevention of Parkinson's disease.

Caffeine can enhance physical strength, perseverance and endurance, and it is also found in some sports functional drinks.

To say "health effect", anti-oxidation may be the biggest advantage of coffee and tea. Caffeine can double the efficacy of antioxidant phenols. Studies show that the overall mortality rate of people who drink two or more cups of coffee every day is lower than that of people who don't drink coffee 14%.

There are good and bad. There is a limit to everything, and it is dangerous to go too far.

Excessive intake of caffeine may lead to poisoning. At the end of 20 15, NHK TV reported a case: a 20-year-old young man died of caffeine poisoning.

The young man works in a gas station because he often turns upside down day and night. In order to refresh himself, he often takes functional drinks as daily drinks.

Maybe the refreshing effect is not obvious enough He also took drugs containing caffeine and eventually died of excessive coffee intake for a short time.

Although this is an extreme example, he relies on a lot of coffee to keep his mental state. According to some data, the lethal dose of caffeine to adults is generally 10g, which can be easily achieved only by directly eating pure products. The milk tea and coffee you usually drink can't reach this dose, and you are more likely to die.

However, this also sounded the alarm for us. Although it will not lead to death, excessive caffeine can cause dependence and even addiction. Once stopped, it will cause mental fatigue, general fatigue and other symptoms-that is, what we call "caffeine collapse."

How much is too much to drink? If you follow the World Health Organization's caffeine intake standard, that is, healthy adults consume less than 200mg at a time and less than 400mg all day. Take the milk tea with the highest caffeine content sampled in Nanjing as an example. The caffeine content is as high as 304. 17mg/kg. If you drink three cups a day, you may exceed the standard.