Tea has many health benefits Special groups need to follow the doctor's advice.

Original title: tea health benefits many special groups need to follow the doctor's advice
the saying "winter drink can protect against the cold, summer drink to summer trouble." Summer people's drinking water will increase, but drink boiled water has no taste, drink "fat house happy water" and fear of fat, tea has become a lot of people's choice. But tea-loving friends have recently been "tea easy kidney stones" "long-term tea to increase the risk of kidney stones" and other rumors of the article scared. What the hell is going on? Let's talk about it in detail.
There are three types of causes of kidney stones
to find these rumors, read the logic found that they mainly lie in: tea contains herbal acid, and calcium grass acid is one of the causes of kidney stones, so often drink tea easily lead to kidney stones. But this seems to be a logical logic, a closer look is not so reliable, there are many loopholes.
in fact, kidney stones are not just "kidney stones", its real name in medicine is actually "urinary stones." Urological stones are a relatively common condition, stones may appear in the kidneys, bladder, ureter and urethra and other parts, but kidney and ureter stones are more common, so we often call urological stones kidney stones kidney stones.
did the urinary stones form? At present, it is generally believed that there are three main mechanisms of stone formation: first, the oversaturation of urine stone-forming substances;
simple summary is: the generation of stones, row out, kidneys can not.
, there are many factors that lead to the 12, such as obesity, hyperlipidemia, diabetes, genetic abnormalities and so on.
ingestion of herbal acid does not necessarily result in kidney stones
the incidence of kidney stones is high in middle-aged and older men (30-60 years of age), about 10%, and depends on age, gender and race. Nearly 80% of kidney stones are calcium folic acid stones, 15% calcium phosphate stones, and the rest are uric acid stones, cysteine stones and infectious stones.
incidence of stone is so high, calcium asphalt caused by kidney stones so much, ingestion of herbal acid will certainly lead to the disease? The doctor didn't say that.
Many studies in China have made it clear that the formation of urological stones is a long and complex process, although there are many studies on its pathogenesis, but also formed a lot of hypothosis and theory, but in view of the variety of pathogenic factors, and disease formation and risk factors are not simple causality, so there is no hypothesis or mechanism to fully explain how stones form.
all teas are rich in herbal acid is based on a general
in the case of bitter tea, for example, under a microscope to observe the presence of calcium asphalt in its thin-walled cells. Is that high? That's hard to say.
If you look at the soluble solid composition concentration and herbal acid content of various tea extracts, you can see that many tea substances do contain herbal acid, for black tea, green tea, there is a high hertic acid content (44mg/kg-90mg/kg), while the herbal acid content of oolong tea is only 5mg/kg-47mg/kg. In Wulong tea, daffodils and Wuyi daffodils have higher herbic acid content, and special Wuyi daffodils have a high herbic acid content of 47 mg/kg. The grass acid content of Buddha's hand is low. The grass acid content of Tieguanyin is 5mg/kg-30mg/kg. (Here data refer to Qu Xincheng and other "bitter tea and five-pry holly's nature and micro-identification")
So different types of tea, different production processes and other factors will lead to different levels of grass acid tea.
A lot of foods have a higher level of herbic acid than tea
simply listing the herbic acid content of tea may not be intuitively felt, and we compare it with spinach with spinach, which is often said to be high in herbal acid. Referring to liu Xiaoxia and others made "nitrogen levels on different spinach varieties photolytic properties, nitrate and herbal acid content" of the study data, it can be seen that spinach soluble grass acid content of about 12 to 16 mg /g, that is, more than 12000mg/kg, even if the highest concentration of tea grass acid 90mg/kg to compare, in front of spinach is also a small witch. Therefore, if according to the logic of rumors, spinach, beet, chocolate and other foods with high levels of herbal acid should all be respected, do not eat.
In fact, in general, the absorption rate of grassic acid in food is very low, about 2.4% to 14.4%, the vast majority of herbal acid has not been absorbed by the small intestine has been combined with calcium in food with excreta excreta excreted. Therefore, normal people eat these high herbal acid content of food in moderants does not affect health at all. Similarly, the absorption rate of grass acid in tea is lower than that of them, how can it pose such a great threat? What's more, normal people can eat 100g of spinach a day, who can eat 100g of tea?
health benefits of drinking tea have been confirmed by
, of course, nothing is absolute. If there is a certain number of kidney disease or stone frequent patients, or to eat less herbal acid content of high food or use appropriate treatment, tea drinking should also follow the doctor's instructions can not be blindly taken.
so far, tea "black history" has been "whitewashed." But before it's over, the benefits of tea to kidneys haven't been seen yet: The Institute of Pharmaceutical Preparations at Three Gorges University has found that tea polysaccharides in tea can significantly improve biotransmission indicators in mice with diabetic nephropathy; Removing free fundamentals and inhibiting lipid peroxidation processes to reduce kidney damage in rats with renal syndrome, and articles published by Ningbo Urological and Kidney Hospital show that EGCG in tea can reduce the body's peroxide damage and reduce the risk of forming stones . . .
. There is a lot of disagreement about how to drink tea. At present, the upper limit seen is about 12g per day (some articles think not more than 10g, some say no more than 5g), and daily tea drinking 3 to 4 bubbles is appropriate. For friends who don't drink tea very often, don't worry about the herbal acid brought by tea, and for friends who often drink tea and are healthy, master the right brewing method and drink daily without worrying too much about the risk of kidney stones. But for kidney stone patients, poor health friends and pregnant women and other special groups, or recommend not to drink too much tea every day, follow the doctor's advice. (Han)