The components in tea include polyphenols, catechins, tannins, caffeine, theanine, phosphorus and so on. Among them, polyphenols, catechins, caffeine and so on have been confirmed by many scientific studies, which have the effects of losing weight, reducing blood fat and preventing cardiovascular diseases. Nutritionists said that according to a human experiment of polyphenols and catechins, overweight and obese subjects drank a bottle of high polyphenols and catechins every day, and after 12 weeks, they found an average reduction of 1.6 kg. Mainly catechins can stimulate sympathetic nerve, promote body heat metabolism and fat oxidative decomposition, and may also have the effect of suppressing appetite.
What herbal teas are there?
Not all tea leaves are suitable for herbal tea! Generally speaking, it can be divided into non-fermented tea (green tea and yellow tea), partially fermented tea (white tea, packaged tea, alpine tea, frozen top oolong tea, Tieguanyin tea and Bai Hao oolong tea) and completely fermented tea (black tea, black tea and Pu 'er tea). In terms of characteristics, completely fermented tea is not suitable for cold soaking, but it does not ferment tea leaves.
If you want to extract the effective components from tea, it depends on temperature, time, tea varieties and usage ratio. Fermented tea is suitable for hot soaking for a short time, and sweet tea flavor, tea polyphenols and catechins can be obtained in a short time, while unfermented tea is suitable for cold soaking for a long time, and soaking for 12 hour can obtain sweet tea flavor, tea polyphenols and catechins.
It was found that the longer the tea leaves were soaked in hot water, the more caffeine and tannic acid were released, while the caffeine and tannic acid in cold tea leaves were lower than those in hot tea leaves. Because too much caffeine and tannic acid can easily stimulate gastric acid secretion, too much intake will hurt the stomach.
If you want to give consideration to healthy tea polyphenols and catechins and reduce the release of excessive caffeine and tannic acid, soaking for more than 12 hour is a good choice. If you want to drink a healthy cup of tea as soon as possible, it is suggested that the water temperature is 60℃ ~ 95℃ and the soaking time is about 3 minutes.
When is the best time to have tea?
To avoid hurting the stomach, what problems should we pay attention to besides temperature when drinking tea? Drinking tea has many benefits, such as losing weight, reducing fat, preventing cardiovascular diseases, boosting spirits, relieving emotions and relieving fatigue. But drinking tea is more effective for time. Nutritionist You Weiming pointed out that drinking tea after meals 1 hour is the most suitable time. Most people begin to feel sleepy after meals, mainly because blood flows to the stomach and the brain lacks oxygen at work, so drinking a cup of tea can stimulate the central nervous system and boost the spirit.
If you drink tea at the wrong time, be careful, it will affect your health. Therefore, it is especially reminded that the following time is the wrong time to drink tea, including: fasting for more than 6 hours, when eating, because tannic acid in tea will combine with protein in food to form tannic acid protein, which hinders digestion, and drinking tea on an empty stomach is more likely to make gastric acid secretion uncomfortable.