Drinking Tea is Good for Brain Health
Researchers performed neuroimaging and questionnaire surveys on 36 healthy older adults and found that maintaining tea drinking habits for 25 years or more can have a positive impact on brain function, structure and organization, including stronger functional connections
Tea is one of the most popular drinks in the world, and its importance is second only to water. Nearly 80% of U.S. households have the habit of drinking tea.In 2018, the amount of tea consumed in the United States reached 3.8 billion gallons, but this number is not enough to make the United States among the world’s top ten tea consuming countries.
Studies have found that catechins in tea, especially epigallocatechin-3 gallate (EGCG), may have chemical and cardiovascular protective functions, and it can also delay cognition in patients with Alzheimer’s disease Reduced ability and formation of amyloid plaques
Bulk tea should be stored in sealed, opaque, non-reactive containers, away from heat, light and strong odors. If you do not like to drink tea, you can also consider taking green tea extract supplements, but be careful not to exceed the usual tea intake, as excessive amounts may cause serious liver damage.
Tea is a beverage with a long history. For thousands of years, it has been recognized for its huge and positive health effects. In addition, it has played an important role in cultures around the world. For example, tea has been an integral part of British life for nearly two centuries. In 1840, the Duchess of Bedford found it a pleasure to have a refreshment between lunch and dinner, and thus pioneered the afternoon tea culture. Afternoon tea also changed from the original tea with light snacks, and became a social gathering for the rich.
In contrast, refreshments in Western countries usually focus on food—usually sandwiches and cakes—and on such occasions, tea seems more like a supporting role than the center of everything. On the other hand, Eastern culture promotes tea drinking to an art form for one reason: that is where tea is the origin of life. Tea has been the drink of choice for Chinese people for over 5,000 years in China’s long history.
Today, tea is still one of the most popular drinks around the world, and its importance is second only to water. According to the Tea Association of the USA, 80% of U.S. households have tea leaves, and tea is the only beverage that can make both cold and hot drinks; 84% of Americans drink black tea. 15% is green tea (the different types of tea are described further in this article).
In 2018, Americans drank 84 billion servings of tea, equivalent to 3.8 billion gallons. Although this number is already quite large, the United States has not ranked among the top ten tea consuming countries in the world. The top ten tea consuming countries are Turkey, Ireland, the United Kingdom, Iran, Russia, Morocco, New Zealand, Egypt, Poland and Japan.
What are the benefits of drinking tea regularly and may help develop better brain connections.
Scientists are very interested in the effects of tea on the structure and organization of the brain. They asked participants to complete a questionnaire to remind participants of their tea drinking habits from the age of 45 to the present. They then performed MRI on the participants.
Through imaging results, researchers have found that not only can tea have a positive effect on brain structure, function, and tissues, but also those who drink tea regularly, that is, at least four times a week for 25 years, have stronger functional connections strength. However, they did not find that tea had any effect on the symmetry between the cerebral hemispheres.
Tea drinking culture originated in China. Today, both China and the West produce tea and love to drink tea. Many researchers have devoted themselves to tea drinking. Many scientific evidences have found that drinking tea can fight aging, prevent dementia, improve immunity, and prevent cancer. However, Wu Zhixing, chief physician of the Department of Family Medicine of Chengdu University Hospital, reminded that these positive studies are mainly based on “hot tea”. Although other types of tea are not bad, they are not sure if they are good or not.
What are the health benefits of drinking tea?
Wu Zhixing, who has been involved in clinical tea drinking research for a long time, pointed out that tea drinking research mostly uses green tea extraction to find the most effective concentration of tea polyphenols, and then investigate whether the animal’s tumors have reduced or subsided, or whether they have a positive impact on other health conditions. Mainly “hot tea”, not cold tea, overnight tea or cold bubble black tea.
Wu Zhixing said that the Chengda team published a research survey on tea drinking habits and bone mineral density in 2000, and found that people who have tea drinking habits and have been drinking for more than 10 years have a bone density that is 2% to 6% higher than the average person. Fracture chance. He said that increasing bone density is not simple, but it is easy to lose. Although tea contains caffeine that is not good for bone, tea also contains flavonoids and tea polyphenols, which can inhibit bone loss and promote cell activity.
Chengda’s team also analyzed the relationship between tea and health, and found that people who drink more tea have lower blood pressure, blood lipids and cholesterol concentrations than those who drink less tea. The more tea they drink, the better the benefits, and drinking tea can improve blood sugar. Metabolism, reduce uric acid production, patients with diabetes and gout can drink tea. In addition, tea contains fluoride, gargle with tea can maintain oral bacteria balance, and has anti-inflammatory and bactericidal effects.
Studies have also found that catechins can inhibit the activity of Helicobacter pylori, and drinking tea has indirect help for peptic ulcers. Moreover, long-term tea drinkers have a lower body fat ratio, 20% less than those who do not drink tea, and waist circumference is also 2% less.
Pan Yankai, a nutritionist at Zhongli Tiansheng Hospital, reminded that the catechins and tannins contained in the tea have astringent properties, which have the effect of eliminating greasiness on the taste, but will not make the oil disappear. Although catechins can inhibit fat synthesis and promote oxidative decomposition of fats, they can really achieve weight control with exercise.
Is there a poor health benefit between fermented tea and non-fermented tea?
Tea can be classified according to the degree of fermentation, including unfermented green tea, semi-fermented oolong tea, and fully-fermented black tea. Pan Kaikai said that the higher the degree of fermentation, the less the catechin content will be due to the oxidation relationship, which will be converted into theaflavin and theaflavin. It is assumed that the catechin content of green tea is 100%, oolong tea is about 42%, and black tea is about 18%.
Wu Zhixing said that it can be seen that more fermented tea has less health benefits. However, Pan Yekai said that fermented tea has a unique flavor and taste, and theaflavin and theaflavin are both flavonoids and still have health effects.
As for the Pu’er tea that the elderly love to drink, it belongs to post-fermented tea, that is, stacked after fermentation. Wu Zhixing said that Pu’er tea is mild in nature and has the lowest irritation to the stomach. Although ancient books have mentioned that drinking Pu’er tea is beneficial to health, there is no scientific research evidence. He reminded that Pu’er tea is prone to germs because of stacking, so it must be boiled in hot water instead of brewing.
Does drinking tea affect the absorption of certain nutrients?
Although the tannic acid contained in tea has an antioxidant effect, Wu Zhixing reminded that excessive tannic acid intake can cause gastric mucosal irritation, and drinking tea is not completely without disadvantages.
Pan Yingkai explained that tannic acid, also known as tannic acid or tannin, is a nitrogen-containing alkaline substance with significant physiological effects in plant tissues. When ingested in large amounts, it easily interacts with proteins in the stomach and solidifies to form non-digestible precipitates. Causes slow gastrointestinal motility, affects digestion, and affects protein, iron and calcium absorption. Especially drinking strong tea, it is easy to consume too much tannic acid and caffeine at one time, which causes stomach upset.
Wu Zhixing said that the biggest impact of tea drinking is iron absorption. People with balanced nutrition can drink a cup of tea after a meal, but those who are prone to anemia and pregnant women should take caution before drinking tea. Pan Kaikai also reminded that some studies have pointed out that green tea can interfere with folic acid metabolism. Pregnant women should pay attention to avoid drinking a large amount to avoid affecting fetal development. In addition, green tea contains trace amounts of vitamin K and may interact with anticoagulant drugs. All should be noted.
How is it best to drink tea?
Wu Zhixing said that for animal experiments in tea drinking research, the standard practice is to take 15 grams of green tea extract and brew it into 250 ml. To maximize the health benefits of drinking tea, he recommends drinking 500 ml per day, about 2 mugs. The concentration of tea should be steeped for 2 minutes. If you drink light tea, you can drink up to 1,000 ml a day. Not recommended anymore. ”
Wu Zhixing emphasized that tea must not be soaked for too long. He has carefully analyzed and found that tea can contain thousands of substances. Good substances can be released 2 minutes before brewing, but negative ingredients will be released after soaking. And tea should be drunk hot, once the cool and oxidized, health benefits will be discounted. He suggested that office workers can make tea with a thermos with a filter to keep the tea warm.
Some people can’t finish tea and drink it overnight. Pan Kaikai said that once stored improperly, it is easy to grow bacteria, but basically as long as the tea leaves are taken out and stored properly, there is nothing wrong with drinking overnight tea. In order to avoid affecting the digestion and absorption of the gastrointestinal tract, it is recommended to avoid drinking a large amount of tea or eating tea with meals before meals, and do not drink tea immediately after meals. The best time to drink tea should be 2 to 3 hours after a meal. People who are more sensitive to caffeine should avoid drinking tea before going to bed.
What kind of tea is best? Wu Zhixing said with a smile, “Drinking tea products” is an attitude to life. Strict restrictions can go away. You don’t need to pay attention to health, especially what brand of tea or expensive tea. Instead, “filial pie” is best Seeing Cha Siqin, my heart is more complete! ”
What are the dangers of drinking strong tea
Promote osteoporosis. Drinking strong tea often is one of the reasons for osteoporosis. The main reason is that tea contains more caffeine, and caffeine can promote urinary calcium excretion and bone loss.
What should I do if I can’t sleep after drinking tea?
As soon as some people drink tea, they have trouble sleeping at night, mainly because of the poor quality of tea and the influence of a large amount of caffeine, the tea garden owner who has been making tea for 30 years pointed out. Some teas are easy to make people do not fall asleep after drinking, for example, bitterness, or too much cyan, may cause palpitations and discomfort.
Tea with “less bitterness and high sweetness” contains less caffeine and will not affect sleep.
People who drink tea easily and do n’t sleep well are better off not touching unfermented green tea (more caffeine). All kinds of tea, oolong tea, white oolong tea are suitable.
The tea time must also pay attention, reminded by the Chinese medicine practitioner Cheng Huizheng. According to ancient Chinese medicine books, tea drinking can help “eliminate food after meals and grow spirit in the afternoon.” From this, it is considered that the best tea time is 1 to 2 hours after meals or before 4 pm. No tea (caffeine intake) after 4 pm will not interfere with sleep at night.
How many cups of tea can I drink in a day?
The average person consumes no more than 300 mg of caffeine per day, then each person can drink 2 to 10 cups of tea a day.
However, everyone has a different tolerance for caffeine, and physicians caution that when you experience headaches, palpitations, and tremors, you should reduce your intake.
Who should drink tea carefully?
Although tea is good for health, some people are unhappy and should not drink more. E.g:
People with poor gastrointestinal function and peptic ulcers (gastric ulcer, duodenal ulcer, etc.). In particular, do not drink tea on an empty stomach to avoid stimulating a large amount of gastric acid secretion and causing discomfort.
People with anemia avoid drinking tea. Because research has found that the polyphenols in tea can be combined with some metal ions, such as iron, which may affect hematopoietic function.
People with arrhythmia, palpitations, and mitral valve prolapse.
People with poor kidney function and urinary incontinence. Especially too strong tea will increase the burden on the kidneys and accelerate blood circulation. Long-term drinking is not good for your health.
Pregnant women and children should also drink less tea, it is advisable to drink at most 1-2 cups a day.
Menopausal women with severe palpitations and poor sleep quality must also drink tea carefully.
In addition, avoid drinking tea medication, as it will make the substances and drugs in the tea work, reducing the effectiveness of the medication.