1. Foods that can effectively lower blood sugar are bitter gourd, onion, carrot, auricularia auricula and towel gourd. 2. Bitter gourd contains bitter gourd saponin, which has the same hypoglycemic effect as insulin, and can also stimulate islet to release insulin. Eating 1-2 tons of boiled bitter gourd every day can effectively control blood sugar. Onion is rich in nutrition, and selenium helps to repair the function of islet and stimulate islet to secrete insulin. 3. Sulfonylurea butyric acid in onion can enhance the utilization of sugar by cells and effectively reduce the sugar concentration in blood. Carrots contain a lot of beta carotene, which can help repair the function of islets like selenium and remove accumulated free radicals, thus strengthening the control of blood sugar. 4. Auricularia auricula polysaccharide contained in Auricularia auricula has a good hypoglycemic function, and the ingredients in Luffa can help improve the activity of islet.