Drinking five or six cups of strong tea every day increases the probability of fracture by 70%. Drinking strong tea for a long time is easy to hurt the muscles and bones. Many people have the habit of drinking strong tea. They may think that it has many health-care functions and can refresh their minds. In fact, drinking strong tea will not only cause "tea drunkenness" and insomnia, but also hurt the bones after a long time.
According to an expert's analysis of tea drinking habits and fracture risk of 3 170 elderly people over 50 years old in the United States, people who drink 5 cups of strong tea every day have a 70% higher risk of hip fracture than those who don't drink strong tea. People who drink more than 7 cups of strong tea every day have a relative risk of more than 80%. This is because caffeine in tea can obviously inhibit the absorption of calcium in digestive tract and increase the excretion of calcium in urine. Due to the dual ways of inhibiting absorption and accelerating excretion, calcium deficiency in the body induces calcium loss in bones, which will lead to osteoporosis for a long time and easily lead to fractures.
Not long ago, China Institute of Nutrition and Institute of Food Hygiene determined the fluorine content of 20 kinds of tea in China, and found that the average fluorine content per kilogram of tea was 186.2mg, which was several tens to hundreds times higher than other foods. Among them, the fluorine content of brick tea in Guangxi and Sichuan is as high as 430 mg to 52 1 mg per kilogram. Drinking it for a long time, especially making strong tea, will cause fluorosis.
Because of drinking this tea for a long time, the detection rate of skeletal fluorosis in a certain place in Sichuan is as high as 72.6%. In addition, the contents of aluminum and oxalic acid in tea are high, and the number of pesticide residues exceeding the national allowable standards is also quite large. From the point of view of healthy diet, the daily consumption of tea should be controlled between 5g and 10g.
Drinking strong tea can lead to fluorosis.
News background: It is reported that a recent study in the United States found that the fluoride content in many instant teas exceeded the standard, and excessive drinking would lead to skeletal fluorosis. The standard of fluoride in bottled water and beverages stipulated by the US Food and Drug Administration is no more than 2.4ppm per liter, while the fluoride in ordinary Lipton instant tea sold in the market is 6.5ppm per liter. On March 29th, the Tea Quality Supervision and Testing Center of the Ministry of Agriculture officially announced that the fluorine content of Lipton series products tested all met the national standards.
Although it is a false alarm that the fluoride in Lipton black tea exceeds the standard, it makes us find a long-neglected health problem: drinking tea may also lead to fluorosis. Tea is a traditional health drink in China, which has many benefits to human health, but just like eating food, we should understand the nature of tea. If you don't pay attention to the method of drinking tea, tea will also endanger your health. For example, drinking too much strong tea often can lead to fluorosis.
The safe intake of fluoride in human body is 3 ~ 4.5 mg per day. If you drink tea excessively for a long time, it will lead to dental fluorosis and skeletal fluorosis. To prevent fluorosis, we should pay attention to the following three points:
1. It is best not to drink more than 5g of tea every day. 2. Drink less brick tea with high fluorine content. The elderly and patients with poor renal function should not drink a lot of tea.
Some people like to drink strong tea, because caffeine, theophylline and theobromine in tea can excite the central nervous system, but this will undoubtedly aggravate the possibility of fluorosis. Therefore, women during pregnancy, lactation and menstrual period, as well as patients with peptic ulcer, severe arteriosclerosis and hypertension, insomnia and fever should pay attention to drinking less tea or not drinking tea.
If you want to drink tea healthily, you need to pay attention to the "twelve taboos": 1. Don't drink tea on an empty stomach, tea will cool the spleen and stomach. 2. Avoid drinking hot tea, preferably below 56℃. 3. Avoid drinking Leng Cha, Leng Cha is cold and stagnates, accumulating phlegm. 4. Avoid brewing for too long to prevent oxidation and bacterial pollution. 5. Avoid repeated brewing, harmful trace elements in tea will bubble out at last. 6. avoid drinking before meals, tea will dilute stomach acid. 7. Avoid drinking tea immediately after meals. Tannic acid in tea will affect digestion. 8. Avoid taking medicine with tea. Tannic acid in tea will affect the efficacy. 9. Avoid drinking overnight tea, it will deteriorate after a long time. 10. Don't drink tea after drinking. Drinking tea after drinking will hurt the kidneys. 1 1. Avoid drinking strong tea. Caffeine is addictive and toxic. 12. The inedible teas are: burnt tea, moldy tea, and cross-flavored tea.
Some people encourage obese people to drink strong tea on an empty stomach before meals or after meals to lose weight. The truth is, after drinking strong tea on an empty stomach before meals, the stomach sac is full of tea, so naturally I feel full and don't want to eat any more. Moreover, drinking strong tea after meals can scrape off oil and prevent greasy accumulation.
The components of tea include caffeine, theanine, theobromine, catechin, flavonoids and their glycosides. Among them, the content of caffeine is the highest, accounting for about 4% of the total weight of dry tea.
Caffeine is a white mercerized needle-like crystal, which can stimulate the central nervous system, improve the metabolic rate of human body, and promote the secretion of gastric juice and the digestion of food. Theanine and theobromine have the same effect as caffeine, so it is conceivable that drinking tea after meals can help digestion, but it is hard to say whether it can scrape off the oil.
On the contrary, it should be noted that if tea is soaked too strongly and drunk too much, it will stimulate the increase of gastric acid and gastrointestinal fluid, causing gastrointestinal discomfort. Especially drinking strong tea on an empty stomach, due to the effect of caffeine, often makes the heart excited and excited, and some people will lose sleep all night, which is worthy of attention for patients with heart disease and hypertension.
For people with poor gastrointestinal tract, it is more likely to cause gastric ulcer and duodenal ulcer.
Drinking strong tea before meals is harmful to the stomach, and drinking strong tea after meals is likely to accelerate the stimulation of the central autonomic nervous system and accelerate the digestion of the stomach. After a while, we will feel hungry and want to eat.
If you can't control your patience at this time and eat a bunch of snacks and biscuits before the next meal is in vain, then lose weight!
"How about strong tea?" You can't generalize, but it varies from person to person according to different situations.
Generally speaking, normal people should drink medium-concentration tea every day, and it is enough to put three grams of tea in a glass of water (about one beat), and it is appropriate to brew each cup of tea three times. Ordinary people should not drink too strong tea, because too strong tea contains a lot of caffeine, which will stimulate nerves, especially drinking strong tea at night will cause insomnia.
People suffering from heart disease, hypertension, stomach trouble, constipation, insomnia, neurasthenia, hyperthyroidism and iron deficiency anemia, drinking strong tea is tantamount to "adding insult to injury" and will cause gastrointestinal discomfort.
Breast-feeding women should not drink strong tea, because polyphenols in tea have astringent effect on milk and affect milk secretion.
Drinking a lot of strong tea will accelerate the heartbeat and induce and aggravate the condition of patients with coronary heart disease tachycardia.
But some people, in some cases, drink strong tea instead. Strong tea has no effects of clearing away heat and toxic materials, moistening lung and resolving phlegm, promoting diuresis and promoting digestion, and eliminating fatigue. People who get angry can drink strong tea to promote diuresis; For people with oral inflammation and sore throat, drinking strong tea has anti-inflammatory and bactericidal effects; People with dental caries, drinking strong tea has a preventive effect; People with coronary heart disease who suffer from sinus atrial block or complete atrioventricular block can increase their heart rate by drinking strong tea, which has an auxiliary therapeutic effect.
Women's "fourth stage" is not suitable for drinking strong tea
Because menstrual blood contains methemoglobin, plasma protein and other components, women should eat more iron-rich foods during and after menstruation. Strong tea contains a lot of tannic acid, which is easy to combine with iron in the intestine and precipitate, which hinders the absorption of iron by intestinal mucosa, thus leading to iron deficiency anemia.
Drinking strong tea during pregnancy is not only easy to iron deficiency anemia, but also affects the nutritional supply of the fetus. Strong tea contains high concentration of caffeine, which can increase the heart rate and urine volume of pregnant women, increase the burden on the heart and kidneys, thus inducing pregnancy poisoning symptoms, which is not conducive to the health of mothers and fetuses.
Drinking too much strong tea during childbirth can lead to insomnia. Lack of prenatal sleep often makes the parturient physically weak, and the uterine contraction is weak, leading to dystocia.
Tannic acid in strong tea during lactation is absorbed into the blood, which will inhibit the secretion function of mammary glands, resulting in insufficient milk secretion, thus affecting the development of newborns.
Drinking too much strong tea will hurt your stomach. After drinking strong tea, it will dilute the gastric juice and reduce its concentration, so that the gastric juice can not digest food normally, and there will be symptoms such as indigestion, abdominal distension and abdominal pain. Poor stomach function may even cause duodenal ulcer.
Drinking too much tea often will increase the burden on the cardiovascular system and kidneys, and may also cause symptoms such as palpitation, chest tightness, frequent urination, urgency and dizziness. Because caffeine in strong tea can make the human heart beat faster, thus raising blood pressure; Thus increase that burden on the heart and kidneys.
Old people who drink strong tea for a long time are prone to fracture. 199 1 year, Brown University, Boston University and * * * found a new problem of caffeine in strong tea, that is, strong tea will greatly increase the possibility of fracture in the elderly. The specific research results show that the risk of pelvic fracture is about 70% higher or even more than 80% for people who drink light tea or do not drink tea. In other words, the higher the concentration of tea in the elderly, the greater the possibility of fracture.
The habit of drinking strong tea during lunch break and before going to bed will lead to insomnia and affect the quality of sleep. Tea contains caffeine that excites nerves, which will lead to neurasthenia in the brain over time.
Drinking strong tea is also easy to constipation. Because tannic acid in tea can combine with protein in food to produce a large amount of tannic acid protein, which is not easy to digest and absorb, leading to constipation. If it is not corrected in time, it will even increase the risk of toxic substances and carcinogens being absorbed by the human body.
Drinking strong tea after drinking is even worse. Some people mistakenly think that drinking too much and drinking strong tea can relieve alcohol. That was not the case. Both alcohol and strong tea can excite the heart. After drinking strong tea, the burden on the heart and cardiovascular system is heavier. If it is a person with poor heart function or even heart disease, the consequences are unimaginable. Therefore, drinking strong tea after drinking is harmful to health, not hangover.
In addition, drinking a lot of strong tea may cause iron deficiency anemia. Tannic acid in tea combines with iron, which brings obstacles and influences to human body's absorption of iron.