Green tea benefits and harms of the drink for the human body. Benefits of green tea for the body. All properties and possible harm All about green tea benefits and harms

Is green tea healthy? And if yes, to whom and to what extent?

This drink has been used since ancient times to relieve depression and headaches, and modern people also note its ability to burn fat, lower blood pressure and the level of bad LDL cholesterol in the blood. Today, the Forest Fairy blog will take a closer look at the beneficial properties of green tea for the human body, the correct ways to brew it, and individual cases in which its use can be harmful to your health.

Before you find out what the real benefits of green tea are and what contraindications there are for it, check out these interesting facts:

The benefits and harms of green tea for the body. What does this drink contain?

Green tea is a rich source of potassium, vitamin C and some B vitamins, which dissolve well in water and are absorbed by our body. Another important component of green tea is the antioxidant flavonoids, including proanthocyanidins who are actively fighting age-related diseases, diseases of the circulatory and digestive systems.

More about the beneficial properties of green tea will tell you this table and the information below.

Figure Source: US National Nutrient Database for standard reference. The numbers characterize regular, water-brewed green tea and may vary slightly depending on the variety and growing conditions of the product.

Antioxidants in green tea and their effect on the body

Green tea is distinguished by a rather high content of plant antioxidants - flavonoids and catechins, the most active of which is epigallocatechin gallate or EGCG. This is a very powerful antioxidant, which, according to many scientists, can slow down the growth of cancer cells and the aging of the body. Together with other antioxidants found in green tea, including proanthocyanidins, it also helps:

• Facilitate digestion and speed up the metabolism in the body;
• Lower blood pressure and LDL cholesterol levels in the blood;
• Freshen breath and eliminate bacteria that cause cavities and other oral diseases.

Attention: To date, not enough clinical studies have been conducted to be able to confidently use green tea or its extracts in the treatment of cancer and cardiovascular disease. For example, studies that confirmed the ability of green tea to reduce the risk of developing liver cancer were carried out only among the Chinese and Japanese population.

Still, current data on how green tea affects different people with their individual characteristics remains rather limited. Before using it for medicinal purposes, be sure to consult your doctor and follow the recommended dose.

Caffeine in green tea - good or bad?

A cup of green tea contains an average of about 30 mg of caffeine. For comparison, black tea contains an average of 55 mg, Red Bull 75 mg, and regular coffee 90 mg of caffeine per 250 mg cup. How does this affect a person?

Caffeine is known to have a stimulating effect on the brain, giving a sense of strength and uplifting mood. However, the antioxidant EGCG and L-theanine in green tea neutralize the effects of caffeine to some extent and make this drink much safer. L-theanine is one of the few amino acids that has been shown to reduce anxiety, lower blood pressure, relax, improve learning, and boost immunity. Therefore, a cup of green tea can always be drunk in the evening without fear of insomnia.

Note: in the usual way of brewing tea, we get quite a small amount of L-theanine. To completely release it into a drink, the first brew of green tea is drained, after which the leaves are boiled at a high temperature of water up to 127 ° C.

Here you also need to pay attention to the fact that caffeine contributes to dehydration and is considered a good diuretic. There are studies that have shown that the catechins in green tea prevent the caffeine from dehydrating the body. However, many people have noticed that after drinking tea, they begin to run to the toilet more often. Therefore, just listen to your body and do not abuse this drink if it has the same effect on you.

Finally, we note that many scientists consider the caffeine in green tea to be safe and have even given it GRAS (certainly safe foods and ingredients) status. In any case, today green tea remains the safest and most beneficial of all caffeinated beverages.

Green tea: raises or lowers blood pressure?

Due to the caffeine content, the question often arises: does green tea increase or decrease blood pressure? We have already mentioned above that L-theanine neutralizes the effects of caffeine, but the amount of this amino acid in the drink directly depends on the method of brewing it. It also contains catechins, which have a beneficial effect on the heart and blood vessels. What is the effect of green tea in general?

All experiments carried out gave one result: green tea lowers blood pressure. The cumulative benefits of green tea for hypertensive patients are obvious! A general meta-analysis of studies showed that the systematic consumption of green tea for 3-6 months contributes to a decrease in systolic and diastolic pressure by about 3 mm Hg. Art.

Does Green Tea Really Help You Lose Weight?

No global studies confirming the benefits of green tea for weight loss have yet been conducted. However, there are a number of facts that testify in favor of this assertion:

1. Green tea has the ability to speed up metabolic processes, which makes the human body burn calories faster without any exercise.
2. Green tea is not able to suppress appetite, but it allows you to temporarily increase the endurance of the body. Polyphenols in its composition accelerate thermogenesis (the production of heat by our body to keep all its systems working) and promote the use of calories as energy.
3. The catechins in green tea help regulate blood sugar levels and prevent obesity by preventing glucose from being stored in fat cells.
4. Caffeine, which we talked about above, interacts well with polyphenols and also increases the rate of fat burning.

Slowly but surely, green tea helps to lose weight by causing the body to lose fat while maintaining muscle mass.

Possible harm of green tea to the human body

Moderate regular consumption of green tea is considered generally safe, but there are still some limitations and contraindications for it.

So, green tea can be toxic to the liver if the recommended consumption rates are exceeded (10-29 mg of tea per 1 kg of body weight per day). In addition, too high doses of green tea, which contains a lot of antioxidants, can begin to act as a pro-oxidant and damage healthy cells in the body.

Heartburn and indigestion are common consequences of overconsumption and/or improper brewing of green tea. This harm can be prevented by brewing the drink with water well below boiling point. Ideal - in the range of 71-82 degrees Celsius.

Also, green tea may be contraindicated in the following cases:

• Iron-deficiency anemia. Consuming green tea can create an iron deficiency in your body, which greatly affects people who are anemic. This harmful property of tea can be neutralized by adding lemon to it.
• Allergy. Extremely rare, but still, some people have an allergic reaction to Chinese green tea: swelling of the throat, difficulty breathing, swelling of the lips, tongue and / or face, fever.
• Sensitivity to caffeine. With excessive consumption or hypersensitivity to caffeine, green tea can cause a person to be anxious, have a palpitation of the heart, irritability, sleep problems, etc.
• Pregnancy. Green tea is not recommended for pregnant women to consume in large quantities, especially in the early stages. Caffeine, tannins and catechins in its composition can lead to birth defects.
• Taking medication. If you are taking any medications, be sure to check with your doctor about your green tea intake.

Of course, the benefits of green tea depend on the amount you consume. Experts recommend drinking from 10 to 29 mg of green tea per 1 kg of body weight per day. Thus, for a person weighing 60 kg, the recommended dose is in the range of 600-1740 mg (from 2 to 6 cups), and for a person weighing 85 kg - in the range of 850-2465 mg (3-9 cups). However, given the existing contraindications and research data, it is better not to bring the amount of tea drunk per day to the upper limit. According to several studies, a dose of 6 cups of green tea is too much for normal daily consumption. Side effects of this intake can include frequent urination (and, as a result, dehydration), diarrhea, vomiting, dizziness, headaches, and loss of appetite.

Be healthy!

The fact that a drink from the green leaves of the tea bush is very good for health, people knew in antiquity. For many centuries it has been used as a curative and preventive natural remedy for many ailments. Knowledge about the benefits of green tea has reached our days.

It is recommended to drink it by traditional medicine experts, nutritionists. It is only necessary to take into account the existing contraindications for use. Today we will conduct a small study to find out whether green tea is useful or harmful, how much drink you can drink per day without harming your own health. First, let's find out what is useful green tea?

Beneficial features

Immediately, we note that green tea leaves have an extremely rich composition. They contain several hundred names of biological substances and compounds. There are mineral salts, valuable food acids, almost all vitamins known to pharmacists.

The main value of green tea leaves are alkaloids. Although on the one hand they can bring undoubted benefits to the body. But when abused, the drink can be harmful. For example, the famous alkaloid - caffeine. This substance gives vivacity, fills the body with energy, increases efficiency. And at the same time, in large quantities it can harm the health of the nervous system, heart, blood vessels, increases bone fragility.

True, green tea does not contain pure caffeine, but a softer one - theine. It does not have such a negative effect, it is quickly excreted from the body. Unlike caffeine, it does not excite the nervous system, but invigorates, improves tone, and improves performance. However, green tea still should not be abused.

Quality varieties contain a large amount of catechins. These are flavonoids that have a powerful antioxidant effect on the body. Catechins keep our youth, improve skin condition. They protect against damage to the tissue of the heart, blood vessels. They are very necessary for a person, as they reduce the risk of developing diabetes, osteoporosis. These substances improve, activate metabolic processes, contribute to the elimination of body fat.

Tea leaves contain an extremely valuable vitamin P. Without it, the normal functioning of the body is simply impossible. It must be said that vitamin P is not one substance, but a whole complex of the most useful plant bioflavonoids. They neutralize the action of free radicals, help to cope with allergies. They improve the state of the cardiovascular system, make the capillary walls more elastic.

It should be noted and other useful properties of green tea. For example, with regular use of a freshly brewed drink, the quality of vision improves, memory is restored, and a person’s creative abilities increase. Many note the ability of the drink to alleviate the symptoms of depression.

Why is it harmful?

The beneficial properties of the drink are beyond doubt. However, its excessive use can be harmful. For example, if you drink it a lot, often, brew it hard, this can have the most negative effect on the kidneys, namely, provoke the development of urolithiasis.

Its excessive use adversely affects the liver. If you drink strong green tea in liters, the liver accumulates polyphenols. A small amount of these substances is very useful for the body. But when they accumulate a lot, it causes poisoning.

You also need to know that not everyone can drink a drink from the green leaves of the tea bush, or you should severely limit its use. For example, with caution, you can drink it to people suffering from diseases of the cardiovascular system, as well as with hypotension. In people with peptic ulcer disease, gastritis, the drink can cause heartburn, stomach pain.

Pregnant women, nursing mothers can drink it, but only very weakly brewed and only during the day. Do not drink it in the evening, and then breastfeed your baby. In this case, there may be a violation of sleep in the mother and child. Everyone else also does not need to drink tea at night, especially strongly brewed.

It is certainly harmful for gout sufferers, as its use increases the level of uric acid.

You need to be more careful for people involved in sports who drink it instead of water, in between intense workouts. So, it is absolutely impossible to do this - you can get serious poisoning. Therefore, it is best to drink plain non-carbonated water during training.

Of course, all this does not mean that you need to completely abandon a healthy flavored drink. A small amount won't hurt anyone. You just need to know the measure, take into account some cooking rules. For example, if you need to cheer up, brew tea for 2 minutes. If you need, on the contrary, to calm down, brew it for 5 minutes.

The main thing is not to brew it longer - then it can really lose its beneficial properties. Don't get too carried away with them. Just 3-4 small servings per day is enough. Be healthy!

Green tea, like other types of tea, is made from tea bush(tea or camellia sinensis), which is a plant of the genus Camellia families Tea rooms. By the name "Camellia sinensis" one can correctly conclude that the tea bush was first cultivated in China. From there he came to Japan, then the Dutch brought him to the island of Java, the British brought him to the Himalayas. After that, tea spread to India, Ceylon (now Sri Lanka), Indonesia, and South America.

The difference between green tea and its more popular black "brother" lies in the processing of the tea leaf. Let's talk more about how green tea is made.

Green tea production technology

Green tea production technology consists of the following steps: commits (steaming), twisting, drying and sorting.

Fixing (steaming) is steaming the tea leaf at a temperature of 170-180 o C (Japanese method) or roasting the tea leaf in braziers (hemispherical metal boilers), where it is heated to a temperature of 80-90 o C (Chinese method). The purpose of this stage is the inactivation (elimination of activity) of enzymes and the chemical transformations associated with them. Thus, the main feature in the production of green tea is that they try to stop the fermentation process (oxidative reactions) in it, and not increase it, as is the case with black tea. Steaming or roasting makes the tea leaf elastic, making it easy to roll. After the moisture content of the tea leaf drops to about 60%, the rolling phase begins.

The purpose of twisting is to crush the tissues of the leaf, after which cell sap is released on its surface.

After the twisting stage, the raw material is sent to the dryer. There, tea acquires an olive-green color, and its humidity does not exceed 5%. Drying is carried out with hot air at a temperature of 95-105 o C.

Sorting is the final stage in the production of green tea, which consists in grouping teas according to a uniform appearance (leaf tea or broken tea, tea leaf crumbs or its seeding).

Important constituents of green tea

alkaloids

Green tea has in its chemical composition caffeine, the content of which is higher than in natural coffee. The amount of caffeine directly depends on the correctness of the tea production technology, as well as the initial growing conditions of the tea bush. Green tea also contains theobromine And theophylline.

Polyphenols

Up to 30% of the composition of green tea are polyphenols, in particular catechins, of which the most interesting is epigallocatechin gallate. This tea also contains tannin, the content of which is 2 times higher than in its black counterpart.

Vitamins and minerals

Green tea also contains vitamins (P, C, A, B1, B2, B3, E, etc.) and minerals (calcium, fluorine, iron, iodine, potassium, phosphorus, magnesium, sodium, chromium, manganese, selenium, zinc, etc.).

Benefits of green tea

Green tea has undergone many scientific and medical studies, and to this day continues to arouse interest in its properties, as well as the impact on human health. The results of these studies quite often contradict each other, but in general the following can be said about green tea:

• Catechins contained in green tea are actively absorbed by the lens and retina of the eye, resulting in oxidative stress in the eyes(the process of cell damage due to their oxidation) is reduced for up to 20 hours. Hong Kong scientists have concluded that green tea may be promising in preventing glaucoma.
• Studies conducted in Slovenia have shown that green tea extract has antimicrobial activity.
• Epigallocatechin gallate helps protect brain cells. An experiment conducted at the Israel Institute of Technology on mice showed that this type of catechin fights Parkinson's disease and Alzheimer's disease.
• Epigallocatechin gallate has been laboratory proven to inhibit the growth of cancer cells in prostate cancer. It is also combined with tamoxifen inhibits the development of breast cancer (an in vivo experiment, i.e. on a living organism was carried out on mice, an in vitro experiment, i.e. in a test tube - on human cells).
• Green tea reduces the risk of developing memory and attention disorders by 2 times. The clue to this effect, which has been confirmed in vivo in humans, may lie in the ability of epigallocatechin gallate to pass through the blood-brain barrier.
• Green tea extract, containing polyphenols and caffeine, renews thermogenesis(body heat release) and stimulates fat oxidation. As a result, the metabolic rate increases. The number of heartbeats remains the same. Due to these properties, the risk of developing heart disease when drinking green tea is reduced. And this is confirmed by in vivo experience in people who have had an acute myocardial infarction. When drinking green tea, the mortality among such people from a second heart attack decreased by almost 2 times.
• By itself, the use of green tea does not reduce the level of cholesterol in the human body (although animal studies have shown the opposite). However, when added to green tea extract theaflavin(a pigment that gives dry tea leaves a characteristic shine) contained in black tea, the level of cholesterol in the human body decreases.
• Green tea improves human immunity, and is also an energy stimulator (due to active fat oxidation).
• The systematic use of green tea leads to the normalization of human body weight.
• With a large amount of antioxidants in its composition, green tea extract prevents skin aging and protects it from ultraviolet radiation.
• Despite the lack of scientific evidence that green tea can reduce the risk of developing gastric diseases, as well as help with existing problems associated with them, traditional medicine uses this tea as a remedy for dysentery, indigestion, and also attributes to it the ability to eliminate colitis.
• Science has not proven that green tea in any way affects respiratory diseases, but traditional medicine says that green tea can treat rhinitis, laryngitis, pharyngitis, stomatitis and conjunctivitis (in the form of rinses and washes). The results of such treatment are unknown.
• As far as dentistry is concerned, green tea contains fluoride, so rinsing your teeth and gums with green tea is a preventive measure against cavities.
• Thanks to the same catechins that reduce oxidative processes in the muscles, green tea helps keep the muscles of the body in good shape.
• Green tea can reduce the risk of contracting HIV. In addition, it is able to stop the development of the disease in the infected. These studies are only in the initial stages and they are all related to the same type of catechin, which is called epigallocatechin gallate.
• Green tea lowers systolic and diastolic blood pressure when properly brewed.

Harm of green tea

Excessive consumption of green tea due to its high content of catechins can lead to liver disease. The daily intake of catechins is 500 mg. Many weight loss products are based on green tea extract and contain more than 700 mg of catechins in a single dose, which poses a health risk.

Also, excessive consumption of green tea can cause kidney complications (green tea contains purines and their derivatives). In addition, since green tea somewhat complicates the process of removing uric acid from the body, it is contraindicated in people suffering from rheumatoid arthritis and gout, as well as various diseases of the kidneys and gallbladder.

Green tea should not be consumed by people with increased nervous excitability.

Existing myths about green tea

• Green tea tones and soothes. Green tea is either tonic or calming. If green tea is brewed for 1-2 minutes, it will lower blood pressure due to the minimal caffeine content. The water temperature should be 70-80 degrees. If green tea is infused for 6-9 minutes, brewing with water at 80-90 degrees, we get a strong tonic drink that increases blood pressure.
• Green tea can be stored in a teapot for a day or more. In fact any tea must be drunk for 1 tea ceremony (for 1 reception). For a day, brewed tea will turn into poison, because. the minerals in its composition are completely oxidized.
• It is harmful to drink green tea with milk. It is not true. It's just that when you mix tea with milk, the composition of the tea changes. Tannin forms chelate complexes with milk. In this case, tea will simply become less tonic.
• Coffee and green tea contain equal amounts of caffeine. This is wrong. Green tea contains more caffeine than any type of coffee. This is partly due to the fact that a large amount of caffeine is lost during the processing of coffee beans.
• Green tea has hallucinogenic properties. This is pure fiction. Green tea can tone up, can relax. But it does not contain substances that can cause hallucinations.

Green tea is tea that is obtained in a special way. Its fermentation is stopped immediately after collection and exposed to hot steam. Varieties of green tea are varied. They depend on the varieties of tea bushes from which its leaves are collected.

Green tea comes from China. Nowadays, it is very common in the west, where black tea used to be traditional.

Just recently, the inhabitants of Russia learned how green tea is useful: it is so rich in vitamins that it literally saves from all ailments. It promotes weight loss, relieves hangover, rejuvenates the skin, protects against the harmful effects of a computer, lowers blood pressure, increases efficiency, promotes digestion and removes harmful substances from the body. And many, many more things for which he is so loved and appreciated all over the world.

Green tea began to be sold everywhere in Russia, and we, of course, began to buy and consume it in excessive quantities. Naturally, no one thought about the fact that green tea can be harmful.

What is the harm of green tea?

There are also side effects from drinking green tea. This is the inhibition of thinking, clouding of thoughts, cardiac arrhythmia. Why is green tea bad for you? After all, it is an excellent substitute for coffee or black tea.

Basically, it is not advised to drink green tea for pregnant women (due to the high content of caffeine, which can adversely affect the development of the fetus) and the elderly (due to the general weakness of the body). Its immoderate consumption is accompanied by tremor (trembling) of the fingers, insomnia, weakening of the body.

The harmful properties of green tea can be greatly increased if it is insisted for a long time. But how much exactly you need to properly brew green tea has not been established. We can only say with certainty that it is better to brew green tea every time before drinking it. Do not pour boiling water into the old tea leaves, because the vitamins are already lost anyway, and we don’t need the harmful microorganisms that multiply in the old tea leaves. But on the other hand, with this yesterday's solution, you can wipe the skin of your face and hands, and even bury it in your eyes. The skin will rejuvenate, and the whites of the eyes will get rid of redness.

I must add that it is not recommended to drink green tea before meals and immediately after it, wait 30-40 minutes so as not to slow down the digestive processes of the body. Do not drink very hot green tea, this adversely affects the condition of the stomach and esophagus.

American scientists, conducting their research, came to the conclusion that the constant use of such tea is harmful to the kidneys and liver. This is due to the fact that with the excessive use of green tea, the substance polyphenol accumulates in the body (this is a beneficial bacterium, but its high content destroys the body), which adversely affects these internal organs of a person.

There is an opinion that green tea is bad for men. Scientifically, this fact has not been established; green tea does not cause direct harm to men's health and male strength. For men, it has as many beneficial and harmful properties as it does for women. So, dear men, use in moderation.

I will conclude that if green tea is consumed moderately, besides, if it is not hot and not infused, then it is more useful than harmful. Unless, of course, you suffer from the above diseases. I think that we figured out whether green tea is harmful or beneficial. Drink it with lemon or honey and be healthy!

Everyone knows about the healing properties of green tea. And many are sure that this delicious drink is completely harmless, because it has so many health benefits. But there are hidden dangers in this health drink, which will be discussed: the harm of green tea.

Based on research conducted by the UK Tea Council (UK Tea Council), It was found that a healthy drink with excessive use can cause side effects to human health.

What harm can green tea do?

The harm of green tea is expressed in its side effect, which experts associate with the content of caffeine and tannins (tannin and catechin).

In the meantime, tea has enormous health benefits. Read, Green tea prolongs life.

Tannins. In their effect, the tannins contained in the tea leaf are similar to vitamin P, they strengthen the walls of blood vessels and capillaries. The tea itself is given flavor and astringency. But their high concentration in tea irritates the walls of the stomach, they slow down the absorption and assimilation of certain trace elements and can disrupt the functioning of the liver and kidneys.

Caffeine- a purine alkaloid, is a powerful stimulant of the human nervous system, which has a number of positive effects on health. But an overdose of the alkaloid causes disruption of the heart, stomach, intestines and other body systems.

With an overabundance of even the most useful food, the body is in danger, because all products contain chemical elements and biologically active substances that the body cannot absorb indefinitely. Their excessive exposure takes the body out of the comfort zone, causing failures and disruptions in the functioning of organs and systems.

Side effects or why to comply with the norm

Scientists have established a number of side effects that occur more often with an overdose of green tea, which is harmful for both women and men.

Changes the acidity of the stomach

Green tea changes the acidity of gastric juice, increasing it above normal, which causes irritation of the walls of the stomach and can provoke heartburn. Scientists came to this conclusion, studies have shown that tea stimulates the production of stomach acid.

To neutralize its effect on the walls of the stomach, you can add sugar to tea, which, again, is not welcomed by everyone. It is better to drink a drink after a meal or between meals, when the stomach has not yet been freed from food.

People with high stomach acid and peptic ulcer need to be more careful in drinking this drink.

Reduces iron absorption

Since tea is drunk only after a meal, it interacts with substances contained in food. It has been established that caffeine, or rather theine (the variety that is contained in tea, differs in that it is absorbed only in the intestines), reduces the absorption of iron by 25%. This applies more to the non-heme iron found in eggs, dairy products, and plant-based foods.

But this harmful effect on the body, fortunately, can be neutralized if you add fresh lemon juice to a cup of tea or eat vegetables and fruits rich in vitamin C first (greens from the garden with dark green leaves, tomatoes, broccoli, lemon, currants).

For women, it is important to observe moderation in tea drinking. Often without that, they suffer from anemia and iron deficiency, and large concentrations of tea exacerbate this situation. During pregnancy and breastfeeding, the concentration of caffeine can affect the development of the fetus and the health of the child.

Contributes to the development of chronic headaches

If a person constantly consumes drinks containing caffeine, the body gradually gets used to it. And with a lack of this “doping”, he responds with a long headache. This is a kind of caffeine addiction, causing a kind of withdrawal when it is not enough.

Additional intake of drinks solves this problem after 25-30 minutes, but is it worth accustoming your body to such an addiction? If headaches appear due to a lack of caffeine doping, it is better to completely abandon such drinks. After all, these symptoms will gradually increase.

Sometimes people have chronic headaches that turn into migraines. Studying such cases, scientists have found a connection of such pain with the use of drinks (in large doses) containing caffeine.

Causes anxiety and nervousness, interferes with restful sleep

All these symptoms are more pronounced in sensitive people with overdose. It's all about the substance xanthine, which is a purine base and a precursor of uric acid. Its derivative is caffeine.

Its side effect on the human body is the ability to block sleep hormones in the brain, and it also activates the production of adrenaline.

Increases heart rate and blood pressure

Sometimes there is a rapid contraction of the muscles of the heart (palpitations) or abnormal contraction, with rhythm disturbance. As a rule, such failures and violations pass quickly. And if such cases take place, then it is better to talk with your doctor, undergo an examination and identify the true cause of the deviations.

If a person has an increased sensitivity to caffeine and its derivatives, then it is better to refuse drinks containing it in their composition.

You should not get carried away with drinks and people with high blood pressure, the fact that caffeine affects the increase in pressure is well known.

Causes diarrhea

This feature directly depends on the individual sensitivity of the organism. In the lining of the mucous membrane of the digestive organs, a huge number of neurons (nerve cells and endings) are concentrated. Therefore, the digestive organs are very sensitive to all chemicals that come with food.

And drinks containing caffeine are rich in organic acids (citric, succinic, malic, oxalic), which stimulate the production of bile. At some point, this plays a positive role.

But accumulations of bile, in turn, trigger mechanisms in response to the effects of biologically active substances that make you run to the toilet. For those on whom caffeinated drinks have a laxative effect, it is best to avoid them.

Promotes heartburn and vomiting

Medical experts acknowledge the fact that caffeinated drinks can cause heartburn. This is explained by the fact that when the mucous membrane is irritated by caffeine derivatives, the production of hydrochloric acid increases.

And since the active substances also have vasoconstrictive abilities, this to some extent disrupts the work of the sphincter, which does not work on time and passes hydrochloric acid into the esophagus.

Do not drink the drink hot, as it irritates the gastric mucosa more and do not work in an inclination after drinking a cup of tea.

An overdose of tea sometimes causes nausea, which turns into vomiting, which is rare. This is also associated with a change in the acidity of the stomach and the irritating effect of active substances on the vomiting center of the brain.

Possible dizziness, ringing in the ears

Caffeine derivatives have insidious properties. In small doses, they increase blood pressure, cause vasospasm, which can cause dizziness.

With an overdose, on the contrary. lower the pressure. And again, they cause weakness and dizziness. You may experience ringing in the ears, especially with high blood pressure.

Causes trembling of the limbs and lack of calcium in the body

Can I drink cold tea

Experts do not recommend drinking both too hot tea and cold tea. Hot tea can burn you, and frequent consumption of hot drinks causes a mutation in the epithelial cells lining the throat, leading to the formation of a malignant tumor.

Cold tea, after standing, quickly oxidizes, which leads to the destruction of the vitamins, minerals and active biological substances contained in it. There will be no particular harm from this, just thinking about the usefulness, you will drink a pacifier. But in cold tea, a favorable environment for the reproduction of bacteria is still created.

The biologically active substances contained in green tea, which bring benefits, can be potentially harmful to health if consumed in excessive amounts. The harm of green tea for the body lies only in this reason. If you follow the rule of the golden mean, then all problems will go aside.

The judicious use of tea turns the caffeine and tannin contained in it into friendly substances that bring only health.

• And in this article, read about the benefits:

Drink tea wisely and be healthy!

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