Black oolong tea usually cannot achieve the purpose of lowering sugar, and food as well as drinks in daily life cannot replace medication for treatment. Black oolong tea contains tea polyphenols, plant bases, proteins, amino acids, vitamins, pectins, organic acids, lipopolysaccharides, sugars, enzymes, pigments and other ingredients. And these ingredients can meet the body needs part of the nutrients, can not achieve the purpose of lowering blood sugar. For the lowering of blood glucose at present more oral medication-based, commonly used hypoglycemic drugs such as metformin, acarbose, selegiline, etc., if the effect of drug therapy is not good, you can also choose to inject insulin therapy. For patients who need to lower blood sugar is not recommended to indiscriminate use of food or drink, should go to the local hospital in a timely manner, found that the problem should be treated under the guidance of the doctor, should follow the doctor’s instructions to take hypoglycemic drugs.