To drink black tea, make clear of five things first

Black tea is recognized as a healthy drink However, is everyone fit to drink? I'd like to answer your most concerned questions one by one Can easy insomnia person drink? Caffeine is the main ingredient that affects sleep in tea The caffeine content of black tea is higher than that of green tea, because black tea belongs to completely fermented tea and green tea belongs to non fermented tea In the process of tea fermentation, the structure of leaves will change, in which caffeine is easier to penetrate into the water In addition, the brewing temperature of black tea is higher than that of green tea, and the soaking time is longer than that of green tea, so the caffeine content of black tea is higher Those who have sleep problems should drink less or no black tea after 3pm, especially in the evening This is not only because caffeine can make people nervous, but also because it has diuretic effect If you drink too much, you will get up at night and sleep hard Can you nourish your stomach? There has been a saying among the people that "green tea hurts the stomach, black tea nourishes the stomach" In fact, tea polyphenols in tea have astringency, which can stimulate stomach to a certain extent, especially in the case of fasting Green tea has a higher content of tea polyphenols, which will stimulate the stomach more obviously, while black tea is made by fermentation and baking, in which tea polyphenols have oxidation reaction during the fermentation process, the content is significantly reduced, and the gastric irritation is less than green tea Although the polyphenols of black tea are reduced, the caffeine content is increased, and the caffeine also stimulates the stomach, so the saying of "black tea nourishes the stomach" is not rigorous In addition, the view that the stomach is not suitable for drinking black tea is also wrong For people with too much stomach acid, caffeine in black tea is not conducive to control stomach acid, but may cause physical discomfort Can't the person of urolithiasis drink? Tea contains oxalic acid, a large number of oxalic acid is easy to combine with the calcium discharged from the urinary system, forming calcium oxalate precipitation, which is known as stone The content of oxalic acid in black tea is high, so for some calcium oxalate stone patients, it is better to drink less black tea Can hypertensive patients drink it? Some studies have found that moderate drinking of black tea may slightly increase blood pressure, but the effect is only for a while rather than for a long time In addition, some studies have found that, compared with those who do not drink tea, drinking black tea can significantly reduce blood pressure, so patients with hypertension can drink black tea, but do not drink too strong Can you lose weight? Tea polyphenols and caffeine in black tea can promote metabolism, which in theory is helpful to lose weight, but after drinking tea for a period of time, the human body will tolerate caffeine, which has no weak effect on losing weight As for tea polyphenols, there are more green tea than black tea The study found that green tea extract has little effect on weight loss, so don't expect to drink black tea to lose weight.