A lot of relevant researches have shown that, tea leaves can help prevent and treat a variety of modern diseases, such as the diseases caused by radiation, cardio-cerebrovascular diseases, cancer, and so on. In the following passage, we will mainly talk about four effects of tea leaves, which are very beneficial to human health.

Firstly, help refresh the mind.
The caffeine contained in tea can promote the excitement of the central nerve system in human body, strengthen the exciting process of cerebral cortex, so as to play the effects of keeping up one's spirit, refreshing the mind, as well as purifying the heart.

Secondly, help reduce fat and promote digestion.
Tea leaves have great effects in promoting the digestion and reducing the fat in human body. In other words, it can help to reduce weight. This is because the caffeine contained in tea can increase the secretion of gastric juice, so as to promote the digestion of food, and enhance the ability of breaking down the fat. As a result, it can naturally play an important role in weight loss.

Thirdly, help promote urination and recover from fatigue.
The caffeine contained in tea can stimulate the kidney, promote the discharge of urine out of body, improve the filtering rate of kidney, and reduce the residence time of harmful materials in the kidney. What's more, caffeine can also eliminate the excessive lactic acid remaining in the urine, so as to help the human body eliminate fatigue as soon as possible.

Fourthly, help protect teeth and improve eyesight.
Tea leaves contain a large number of fluorine. If one person drinks 10 grams of tea leaves every day, he can absorb 1 mg to 1.5 mg of water-soluble fluorine. What's more, tea is a kind of alkaline drink, which can inhibit the decrease of calcium in the body. This is very beneficial to prevent decayed tooth, protect the teeth, as well as strengthen the teeth. According to relative data, it shows that tea leaves can reduce the rate of dental decay by 80%. What's more, other researches have also confirmed that, tea leaves play a good effect in the prevention and treatment of cataract. This is because the tea leaves contain a high content of vitamin C, which can reduce the turbidity of eye crystals. As a result, often drinking tea has positive effects in reducing eye diseases, protecting the eyes, improving the eyesight, and so on.