Does drinking overnight tea have any effect on the body?

I like to brew a pot of tea and drink it slowly, but I often can't finish it, so I can only leave it overnight and drink it again the next day. Many people say that overnight tea can breed bacteria and produce nitrite so it can't be consumed, is this true?

As long as it is stored properly, overnight tea is okay to use. Many people worry about nitrite production, but they don't have to. CCTV reporters have done experiments to send a cup of tea brewed for 12 hours, a cup brewed for 24 hours, and a cup of freshly brewed tea to the Beijing Institute of Nutrition Source for testing.

The results showed that the nitrite content of the tea with 12 hours and 24 hours and the freshly brewed tea did not change significantly, and the highest content was only about 1 4 of the national drinking water standard.

As for the breeding of bacteria, the sugar and amino acid content in tea is very low, and it is not a good "culture medium" for bacteria, and if the lid is closed, it is difficult for bacteria in the air to fall into the teacup, so there is no need to worry too much.

So how long can tea generally sit without spoiling? How to store tea well?

The question of how long it will spoil is not conclusive, which is closely related to factors such as the preservation environment, the condition of the tea, and the variety of tea, but if there is a peculiar smell or obvious changes in color and texture, it is better not to drink it.

It is recommended to close the container with a lid or plastic wrap for unfinished tea, and then put it in the refrigerator for storage, 8 12 hours will generally not deteriorate, after all, one of the fashionable cold brew tea preparation methods is to add cold water and tea leaves to the container, and then put it in the refrigerator to soak and extract for 8 hours.

The discovery and use of tea has a history of thousands of years, and according to research, there are written records of tea affairs with a history of more than 2,000 years. The Book of Tea written by Lu Yu in the Tang Dynasty is the earliest, most complete and most comprehensive tea monograph existing in China and even in the world, and is known as the "Encyclopedia of Tea". Nowadays, the "footprint" of tea has spread all over the world, and it has become a popular green drink.

So some people say that drinking overnight tea can cause cancer, is it true?

Overnight tea generally refers to tea leaves that have been steeped for more than 12 hours, or left on hold overnight. The main reason why some people say that drinking overnight tea causes cancer is that overnight tea produces a strong carcinogen: nitrosamines.

Nitrosamines are one of the important chemical carcinogens and one of the four major food contaminants. Nitrosamines are found in food, cosmetics, beer, and cigarettes. Especially in smoked food, there are a lot of nitrosamines, and when smoked food is ingested with wine, the harm of nitrosamines to human health will increase exponentially.

Nitrite, nitrate and amines, which are the basic substances for the formation of nitrosamines, are ubiquitous in food, for example, the average nitrite content in vegetables is about 4 mg kg, meat is about 3 mg kg, eggs are about 5 mg kg, and so on.

In people's daily diet, most of the nitrite is excreted in the urine like a "passerby" in the human body, and it will only be converted into nitrosamines under certain conditions. Therefore, under normal conditions, nitrite in the diet will not cause harm to human health, only excessive intake and lack of vitamin C in the body can cause harm to the human body. Tea itself is rich in vitamin C and tea polyphenols, which in turn become a natural inhibitor of nitrosamine synthesis.

Therefore, there is no scientific basis for the carcinogenicity of overnight tea. However, from a nutritional and hygiene point of view, many nutrients in overnight tea are lost, and microbial content increases. If deterioration occurs in some cases, it can also cause potential sexual harm due to the individual's physical condition.

Can drinking tea overnight cause cancer.

Scientifically speaking, there is no harm in drinking overnight tea, but sometimes due to the high ambient temperature, the tea leaves in the cup are easy to be contaminated by bacteria and moldy, so it is better not to drink it at this time. However, overnight tea has its wonders:1.

Overnight cold tea can relieve itching, overnight tea can cure red eye silk In the hot summer, people with loose tendons are easy to sweat and sandwich their backs, thus causing itching in the head or body. For other itches of unknown cause, you can also make good use of overnight cold tea compress, the effect is good. If your eyes are often watery or your eyes are covered with red threads, as long as you wash your eyes with overnight tea a few times a day, it will be effective after a few days, and you will have a pair of healthy and smart eyes.

2。Shampoo with overnight tea has a good effect, the effect of increasing eyelashes, and the strong tea can converge the sun** Washing hair with overnight tea can have miraculous effects, which can solve problems such as itchy scalp, excessive dandruff and frequent hair loss. Leave the leftover tea to cool and use a cotton swab to moisten your eyelashes before going to bed or the next morning, which can achieve the effect of eyelash growth, so try it now!

It is guaranteed to be the cheapest and most economical "eyelash growth serum"! The ** that has been exposed to the sun will be red and hot, and you can rub it with very strong cold tea**, and the tannic acid in the tea has an astringent effect on **, which is of great help to soothe the skin. 3。

After eating raw garlic and green onions, chew a mouthful of residual tea or rinse your mouth with tea water, which can not only remove bad breath, but also remove greasy feelings. Cooking rice with residual tea water, rice is not only colorful, fragrant and tasteful, but also can be anti-inflammatory.

Overnight tea can not be drunk, there has been a chemical change.

Tea and overnight !? I used to do this a lot, and I still drink it for days!!

1. It is not recommended to drink overnight tea for too long, on the one hand, because the interval is too long, there will be a large amount of nutrients lost, and a large number of antioxidants such as tea polyphenols will be lost, and at the same time, tea also contains certain nutrients, which are easy to breed bacteria and may lead to intestinal infection.

2. Of course, if it is an unspoiled overnight tea, it should not be too harmful to the body, and from a medical point of view, there are some benefits, because overnight tea is rich in acids, which can prevent capillary bleeding, if there is a mouth ulcer, gingivitis, eczema, etc., you can drink overnight tea, and there are anti-cancer, antioxidant, eye-bright, anti-itching effects.

Overnight tea can harm gastrointestinal health, induce stones, cause cancer in the body, and affect digestive function, which are all harms of drinking overnight tea.

Overnight tea is a relatively long brewed tea, this physique tea is deteriorated, easy to breed some bacteria, will harm human health, in addition to overnight tea will also produce a large amount of tannic acid, this substance and oxalic acid in other foods will produce substances that are not good for the human body, will also harm human health, easy to make stones high, so usually drink tea as soon as possible after brewing, do not drink overnight tea.

1. Endangering gastrointestinal health.

Overnight tea will endanger human gastrointestinal health, because overnight tea is stored for a long time, easy to breed mold and a variety of germs, people drink this health tea after the state of mold and bacteria into the body, easy to endanger intestinal health, intestinal inflammation, but also let people have abdominal pain and diarrhea and other uncomfortable symptoms, human gastrointestinal function will be seriously impaired, can not digest other food normally.

Second, let the incidence of stones be high.

Inducing stones is also the main harm of drinking overnight tea, because overnight tea contains a large amount of tannic acid, people will absorb sulfuric acid after drinking overnight tea, it will react with oxalic acid in other foods, and produce some substances that the human body cannot digest and absorb, this substance will produce stones after accumulation in the body, which will make gallstones and urinary tract stones high, and the health of the body will be seriously damaged.

3. Cause cancer in the human body.

People drink overnight tea and lead to subdivision cancer, because lotus leaf tea will produce some carcinogenic ingredients in the process of soaking for a long time, and the human body will cause cells to become cancerous after absorbing these substances, so that the incidence of cancer is high, which is not good for health, and some heavy metals will be produced in overnight tea, which will also endanger human health after they enter the human body, and will make some blood diseases appear. Overnight tea is harmful to the human body, and there are many harms, but this is for those spoiled overnight tea, if the tea soup is overnight but not spoiled, it can still be drunk and there is no obvious harm, but at this time, the nutrients in the tea soup have been lost a lot, and drinking it again will not have a good health effect.

What is the harm of overnight tea to our body Many people like to drink tea in daily life, because different tea brewing methods are different, so the taste will be different, so why not drink overnight tea? What does overnight tea mean? As people pay more and more attention to health preservation, the efficacy of tea has been recognized by the world.

However, there has been a rumor circulating on the Internet that overnight tea cannot be drunk, and it will cause cancer if drunk. So is that really the case?

<> because tea contains tea polyphenols, it is easy to oxidize into brown jelly in air and water, which is called tea rust. Tea rust contains pick, lead, iron, arsenic, mercury and other substances. The longer tea leaves are exposed to the air, the more polyphenols oxidize to rust.

After tea rust enters the human body, it binds to and precipitates with proteins, fats and vitamins in food, hindering the absorption and digestion of nutrients. Once these oxidizing substances enter the human body, they can also cause inflammation, ulcers, necrosis and other lesions in organs such as kidneys, liver, and stomach. Therefore, overnight tea should not be drunk, and the tea set should be scrubbed frequently.

First of all, you can't drink overnight tea. If it is white water overnight tea, don't drink it too cold, no matter what kind of tea, don't drink it while it's cold (personal experience is that drinking cold water doesn't quench your thirst), of course, it's okay to drink a cup of herbal tea to go to the fire in the hot summer. In addition, tea soaked in silver-plated containers should not be drunk overnight, because some components of tea and silver-plated (mercury) produce toxic substances when heated (hot water).

There is also the fact that after the tea water is cooled, it cannot be drunk overnight. This is because there will be a lot of bacteria in the tea water after cooling, and the cooled tea water will cause diarrhea and discomfort. My personal experience is that the tea in the thermos flask (iron, ceramic, stainless steel, red clay, purple sand liner) can be drunk overnight when the water is not cold, and the longest time, I have drunk tea that has been stored for more than 48 hours.

At that time, the water was still hot, and there was no discomfort after drinking it.

Cause microbial or bacterial growth: Overnight tea is left for a long time and is easy to breed bacteria, so it may affect digestive function and cause diarrhea, abdominal pain, vomiting, etc.

Therefore, it is important to drink plenty of fresh tea and avoid overnight tea.

Categories: Health Wellness >> Health Care Mask.

Problem description: Specifically?

Analysis: It is often assumed that overnight tea should not be drunk. Tea will turn reddish-brown after being left for a long time, in fact, this is due to the oxidation of tea polyphenols into reddish-brown tea pigments.

Studies have shown that tea polyphenols and tea pigments have strong anti-cancer and antioxidant effects, although the content of vitamin C in overnight tea is greatly reduced, but it still has anti-disease effects. However, the temperature is high in summer, and the tea is easy to turn rancid, so if it is left for more than 24 hours, it is best not to drink it, otherwise it will cause diarrhea.

Overnight tea that has not spoiled can not only be drunk, but also has the following uses:

1. Hemostasis: Overnight tea is rich in tannin acid, which can accelerate the condensation of blood. Oral bleeding can be rinsed, **bleeding can be used for bathing.

2. Bright eyes: The tea polyphenols in overnight tea have antibacterial and anti-inflammatory effects, if there are red threads in the eyes, you can wash them with overnight tea several times a day.

3. Solid teeth cleaning: After calcifying the fluorine in tea and the enamel of the teeth, it will enhance the resistance to acidic substances and reduce the occurrence of tooth decay; Fluoride can also eliminate plaque, and it is best to rinse your mouth with tea two or three minutes after eating.

4. Bad breath: Tea contains essential oils, the smell is fragrant, and regular gargling with tea can eliminate bad breath.

5. Anti-itching: Wash your hair or wipe your body with warm overnight tea, the fluoride in the tea can quickly relieve itching, and it can also prevent and treat eczema.

6. Sunscreen: **If you are sunburned by the sun, you can gently wipe it with a towel dipped in overnight tea. Because tannic acid has an astringent effect on **, the flavonoid compounds in tea also have an anti-radiation effect.