Tea is rich in nutrients, including tea polyphenols, caffeine, theophylline, vitamin C, vitamin B, niacin and other high content, tea polyphenols can not only astringent, coagulation of bacterial proteins, play a bactericidal and anti-inflammatory effect, and can promote the absorption of vitamin C and improve its utilization, reduce cholesterol and triglycerides, enhance the toughness of the microvascular wall, thereby reducing the occurrence of atherosclerosis. The excitatory effect caused by theophylline is the effect of caffeine. Because caffeine can excite the central nervous system, enhance the excitement of the cerebral cortex, so as to achieve the purpose of invigorating, improve labor efficiency, theophylline contained in tea can help dissolve fat, has the effect of relieving fat and weight loss, and can dilate blood vessels, promote blood circulation and diuretic effect of potassium discharge. Therefore, it can prevent hypertension and coronary heart disease.