Tea does not have the effect of lowering blood sugar, diabetic patients can not drink tea to achieve the purpose of lowering blood sugar. Diabetes mellitus is a group of diseases caused by absolute or relative insulin secretion or insulin utilization disorder of carbohydrate, protein, fat metabolism disorders, daily dietary control, active exercise, according to the situation of oral medications such as metformin, acarbose, saxagliptin or insulin injections, etc. to control blood glucose. If diabetic patients love tea, they can drink some light tea in moderation, such as green tea, black tea, pu-erh tea, etc. instead of plain water, to promote the excretion of urinary glucose, which is conducive to preventing urinary tract infections. It should be noted that diabetic patients should avoid drinking strong tea, so as not to affect the night sleep, but rather affect the control of blood sugar. Tea does not have the effect of lowering blood sugar, it is recommended that diabetic patients with symptoms to seek medical help, under the guidance of the doctor to choose the right treatment for themselves, daily should follow the doctor’s instructions to take medication, do not recommend self-medication.