The components in tea include polyphenols, catechins, tannins, caffeine, theanine, phosphorus, etc. Among them, polyphenols, catechins and caffeine have been confirmed in many scientific studies, which have the benefits of reducing weight, lowering blood lipid and preventing cardiovascular diseases. Nutritionist 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, it was found that the average reduction was 1.6 kg. Mainly catechin can stimulate sympathetic nerve, promote body heat metabolism and fat oxidative decomposition, and may also have an appetite suppression effect.
What are the cold teas?
Not all tea leaves are suitable for making cold 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 Baihao 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 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 short-time hot soaking, and sweet tea flavor, tea polyphenols and catechins can be obtained in a short time, while unfermented tea is suitable for long-time cold soaking, and it must be soaked in 12 hour to obtain sweet tea flavor, tea polyphenols and catechins.
It is found that the longer the tea leaves are soaked in hot water, the more caffeine and tannic acid are released, while the caffeine and tannic acid in cold tea leaves are lower than those in hot tea leaves. Because too much caffeine and tannic acid are easy to stimulate gastric acid secretion, excessive 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, cold soaking 12 hour or more 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 drink 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 reducing weight, reducing fat, preventing cardiovascular diseases, boosting spirits, soothing emotions, relieving fatigue, etc., but drinking tea is more effective for time. Nutritionist You Weiming pointed out that drinking tea 1 hour after meals is the most suitable, and most people start to feel sleepy after meals, mainly because blood flows to the stomach, and the brain lacks oxygen due to work, so drinking a cup of tea can stimulate the central nervous system to boost.
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, during meals, because tannic acid in tea will combine with protein in food to form tannic acid protein, which will hinder digestion, and drinking tea on an empty stomach is more likely to make stomach acid secretion feel uncomfortable.