What substance in tea provides refreshment?

Tea refreshes because it contains caffeine. Caffeine is a xanthine alkaloid compound, a central nervous system stimulant that temporarily drives away sleepiness and restores energy. Caffeine is a biological alkaloid extracted from tea leaves and coffee, effectively relieving fatigue and stimulating nerves.

Coffee can also refresh you, so why choose tea?

Coffee contains twice the caffeine content of tea per equivalent volume, so coffee's refreshing effect is significantly stronger. However, drinking coffee can lead to arteriosclerosis, while drinking tea can inhibit arteriosclerosis. This is because tea contains more tea polyphenols and vitamin C, which effectively counteract the adverse effects of caffeine. So if you want refreshment, it's better to drink more tea.

Can tea not only refresh but also calm the nerves?

When tea is brewed for about 2 minutes, already 70%-80% of the caffeine has dissolved into the water. Drinking tea at this point has a noticeable refreshing effect. As the brewing time increases, tea polyphenols gradually dissolve into the water, counteracting the effect of caffeine and significantly reducing the refreshing properties. So if you want tea for refreshment, remember not to brew it too long, otherwise it might inhibit neural excitement and have a calming effect.

Will drinking tea while "burning the midnight oil" cause insomnia?

Sometimes, when daytime work or study tasks aren't completed and you have to "burn the midnight oil" to finish, but you're worried that drinking too much tea will keep you awake, what should you do? The editor recommends drinking black tea in the evening because it's fully fermented, contains relatively less caffeine, and is less stimulating, making it suitable for nighttime consumption. Additionally, caffeine does not accumulate in human blood; it's usually metabolized and expelled within a few hours. So try to drink tea earlier in the evening, not right before bed.

Tea is an excellent beverage. You can brew it to drink when you have free time. It not only refreshes and clears the mind but also helps reduce fat, aids in weight loss, beautifies the skin, promotes longevity, and more. No more talk, the editor is off to brew some tea.