Is overnight tea poisonous? Can’t you drink it? Not so evil!

Is overnight tea poisonous? Can’t you drink it? Not so evil!


The saying that “overnight tea is poisonous, ranging from mild diarrhea to serious harm to the body” is widely circulated in the health care industry. Is the “power” of overnight tea really that great? The truth is far less exaggerated. The latest “Science” Rumor List is revealed! Will decreased ovarian function lead to “cliff aging”? Will seasonal allergies pass after a brief period of time? Can’t you eat snail noodles with “odorizer” added? Can atropine reverse myopia? Today I’m packing the truth for you to read for yourself.

The monthly “scientific” rumor list is guided by the Beijing Association for Science and Technology, the Cyberspace Administration of Beijing Municipal Committee, and the Capital Internet Association, and is jointly released by the Beijing Association of Science Journalists and Editors and the Beijing Regional Website Joint Rumor Refutation Platform.

Rumor has it that spinach cannot be eaten because it is so green that it turns black.

The truth: Some people think that the spinach that is so green and black on the market is the product of too much chemical fertilizer. In fact, on the contrary, the darker the green color of green leafy vegetables such as spinach, the more chlorophyll they contain, the more nutrients they synthesize, and the higher their nutritional value.

Spinach is a vegetable that can be grown all year round and has strong cold tolerance. It is divided into spring spinach, summer spinach, autumn spinach and winter spinach. Winter spinach is sown before winter, dormant in winter, and harvested in spring. In order to improve the frost resistance of winter spinach, it is indeed necessary to fertilize and supplement nutrients before dormancy, but this is a necessary measure to help spinach survive the winter. The effect is to increase the chlorophyll content, fully enlarge the leaves, and strengthen photosynthesis so that spinach can accumulate nutrients.

In fact, the contents of folic acid, vitamin K, lutein and magnesium in green leafy vegetables are directly proportional to the chlorophyll content. The darker the color of spinach, the more nutrients are synthesized and the higher the nutritional value. Relatively speaking, greenhouse vegetables and hydroponic vegetables tend to have lighter leaves due to insufficient light and insufficient chlorophyll.

 Rumor has it that overnight tea has toxins and will cause poisoning if you drink it.

The truth is that some people think that overnight tea is poisonous because the nutrients contained in the tea can become a breeding ground for bacteria and fungi. If left undisturbed for a long time, other harmful microorganisms may breed. After drinking, vomiting, diarrhea and other gastrointestinal infection symptoms may occur. .

In fact, there is no strict definition of overnight tea, it mainly refers to tea that has been brewed for too long. Usually, when people make tea, the water temperature is between 90℃ and 100℃. Common bacteria will be killed, and some substances in the tea itself have certain antibacterial effects. Tea left open indoors will have a small amount of bacteria in the air entering, but the bacteria in the tea grow very slowly, so the impact will be minimal.

In addition, tea that has been brewed for too long will not produce toxic substances, except that it will easily become darker in color and taste bitter. The reason why the color becomes darker is due to the oxidation of tea polyphenols.

So you can drink tea that has been brewed for a long time, but there is no need to drink it if it is too bitter.

Rumor has it that “odour-enhancing agents” are added and snail noodles cannot be eaten.

The truth: “Odor enhancer” is actually a common name in the media. It refers to the base packet and smelly sauce used in snail noodles. These products are compound seasonings, and compound food additives are used in them – — Flavors and fragrances, their main function is to give products a specific smell or taste. All legal “odorizers” are allowed for use, have been evaluated and approved by national safety authorities, and are safe when used appropriately.

Some people may worry about whether it will be harmful if it is overdosed? There is no need to worry about this. Because in practical applications, it is impossible to overdose the flavor. One of the characteristics of fragrance is that it is “self-limiting”, which means that if you use a small amount, it will smell very fragrant, but if you use too much, it will be very smelly, which may cause nausea and coughing. This is also the reason why market supervision and management personnel in the news were so smelly that they coughed due to the “odorizer” in the snail noodle shop, and were smoked out of “pain masks”.

Although the snail powder base soup packet contains some seasonings and spices, as long as it is a regular product, food manufacturers follow relevant food safety standards and regulations, and use it reasonably, there will be no food safety problems. In addition, when dining out, try to choose regular restaurants with good hygienic conditions.

Rumor has it that black takeout spoons made from recycled plastic are toxic

The truth: Regarding the question of whether black spoons are hygienic, researchers referred to relevant national standards and added tests for coliforms and salmonella. All test results are integrated, and they are all within the national standard limit. It should be said that they are all safe in terms of safety.

In fact, the color of plastic has no necessary connection with its safety. For consumers, the daily judgment of the safety of plastic products for food mainly depends on the labels on the plastic products. For example, PP material is resistant to high temperatures and is stable to acids, alkali, alcohol and grease. It is often used in plastic tableware and is also the most widely used in take-out tableware; PET is mostly used in beverage bottle packaging, and its material is relatively stable at room temperature, but Containing overheated food will migrate out harmful substances; PE and PVC materials commonly used in plastic wrap will also release toxic substances after high temperatures… In other words, under high temperatures, transparent PE materials are not necessarily safer than black PP materials.

Why do people smell a pungent “odor” when they open a takeout meal kit? It was verified that these were disposable chopsticks from the packaging bag. In order to prevent corrosion and bleaching, during the production process of disposable chopsticks, manufacturers will soak bamboo chopsticks with sulfite. The treated chopsticks will contain sulfur dioxide residue and therefore have a pungent smell. As long as they are within the limit range of the national standard All operations are in compliance with regulations.

Although disposable tableware is non-toxic, for environmental and health reasons, it is recommended to use as little as possible when ordering takeout, whether it is black spoons or other plastic tableware.

Rumor has it that declining ovarian function will lead to “precipitous aging”

The truth is that female ovarian function begins to decline at the age of 25, and will experience a significant period of decline between the ages of 35 and 37. This is a normal physiological phenomenon. Aging is the decline of overall function. The main impact of declining ovarian function is osteoporosis, hot flashes and night sweats, and increased risk of cardiovascular disease. Declining ovarian function within the normal range will not cause sudden changes in facial appearance.

As for the so-called “maintenance packages” of Internet celebrities, they have little effect on delaying the decline of ovarian function. A woman produces approximately 400 follicles in her lifetime. As the follicles are consumed, estrogen secretion gradually decreases. This is a natural law that cannot be changed. Nutritional supplements that claim to be able to maintain the ovaries are not drugs. They have a slow and minimal effect on the human body.

Other drugs that claim to contain estrogen or can promote estrogen secretion should not be used without medical advice, otherwise they may cause hormone secretion disorders and even risk cancer.

Rumor has it that seasonal allergies will go away if you just “just take it”

If the truth is not serious, then there is no need for medication. It is wrong to rely on life. If allergic diseases are allowed to recur repeatedly, they may develop in a serious direction.

Some severe allergic reactions occur suddenly for unknown reasons, and some are acute attacks caused by repeated exposure to allergens over a long period of time. Once an attack occurs, symptoms often spread rapidly throughout the body. Therefore, attention must be paid to allergic diseases to prevent their progression from mild to severe.

The eye symptoms of spring pollen allergies are more prominent than those caused by other types of allergens. Symptoms such as itching, conjunctival edema, redness, and tearing often occur in the eyes. In severe cases, even both eyelids may become red and swollen, secretions may increase, and it may be difficult to open the eyes in the morning. The most effective way to prevent pollen allergies is to stay away from allergens and to reduce outdoor activities as much as possible during periods of high pollen incidence. When going out, it is recommended to be fully armed and wear long clothes, long sleeves, masks, protective goggles, etc. as much as possible. You can also use pollen blocker before going out and apply it on the surface of the nasal cavity to provide physical isolation.

For people with a clear history of pollen allergies, it is recommended to take oral antihistamines 1-2 weeks before the arrival of the allergy season. If you know in advance that the pollen concentration in the place you are going to is high, you can take anti-allergic drugs in advance or take them under the guidance of a doctor. During the allergy season, nasal corticosteroids or antihistamine eye drops should be used regularly until the end of the pollen season. It is not recommended to stop taking the medication on your own.

Rumor has it that “miracle drug” atropine can reverse myopia

The truth: Atropine sulfate eye drops are known as the “miracle drug for myopia” and are the “life-saving straw” that many parents consider to save their children’s vision. However, the main function of atropine is to “prevent” and “control” myopia. It does not have the ability to reverse and treat myopia. It is not a miracle drug for myopia that “can be cured once used.”

As a prescription drug, it has corresponding indications and contraindications, and parents are not allowed to buy it on their own or use it blindly. Children who need atropine are those whose axial growth is too rapid. It is recommended that children who have just been diagnosed with myopia should have their ocular axis reexamined at least once in three months on the basis of optical correction (wearing glasses) and improving their eye-use habits, and judge whether to use atropine based on changes in the ocular axis.

At present, myopia cannot be reversed through medication. Children and adolescents must protect their eyes by developing good reading and writing habits, reducing their dependence on electronic products, and allowing their eyes to rest.

Rumor has it that eating lard can prevent cardiovascular disease

The truth is that most people who think lard is healthier hold this view: Chinese people have been using lard for generations and have always been fine. Nowadays, people dare not eat fatty meat, but the incidence of heart disease has increased significantly. It can be seen that lard is a must-use in dietary therapy and can prevent cardiovascular diseases.

However, you really can’t eat too much lard. Lard is a kind of animal oil, and its main component is fat. Since each gram of fat can produce 9 kilocalories of energy, eating more oil means taking in more energy. Excessive energy accumulation can cause overweight or even obesity. Obesity is a risk factor for chronic diseases such as hyperlipidemia, hypertension, diabetes, atherosclerosis, coronary heart disease, and stroke.

Among the fat components in lard, the saturated fat content can be as high as more than 40%. It is the main fatty acid that increases our serum cholesterol. Relevant guidelines recommend that saturated fatty acid intake should be less than 10% of total dietary energy.

When choosing oils, we can replace foods rich in saturated fat with oils rich in monounsaturated fats (such as tea seed oil, olive oil) and oils rich in polyunsaturated fats (such as sunflower oil, corn oil) . In addition, while reducing fat, certain energy needs can be met by appropriately increasing the amount of protein and carbohydrates. For example, choose foods rich in protein but low in fat, such as fish and shrimp, lean meat, milk, eggs, and soy products, as well as starchy foods such as millet, sweet potatoes, and oatmeal for supplementation. Therefore, if you want to prevent heart disease, it is recommended to eat less lard.


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