1, onion + natto can prevent arteriosclerosis. When cutting onions will involuntarily tears, which is the result of the sulfide contained in the onion play. After entering the body, sulfide will turn into allicin, which can prevent cholesterol from attaching to the walls of blood vessels, so it can effectively prevent diseases such as atherosclerosis. The enzyme contained in the sticky component of natto has the effect of dissolving blood clots and unblocking blood vessels. Diced onions can be eaten together with natto to improve the blood vessel unblocking effect. However, people suffering from blood disorders and taking blood clotting drugs should avoid eating them. 2, onion skin tea can lower blood pressure. The pigment component of onion skin contains powerful antioxidant substances – catechins, which are very effective in the treatment of hypertension and other conditions. Moreover, onion skin contains quercetin, which has the effect of dissolving blood clots and preventing blood clotting. 3, wine lees + onions can lower blood sugar. The sulfide contained in the onion also has the effect of lowering blood sugar. The wine lees contain insulin-like ingredients, which can inhibit the rise of blood sugar, but also contains substances that can promote the decomposition and absorption of proteins. Therefore, it is safe for diabetic patients to eat. The unique flavor of wine lees pickled onions is an excellent food to prevent diabetes. 4, red wine + onion can soften blood vessels. Onions have a therapeutic effect on unblocking the sticky blood and preventing brain infarction, myocardial infarction and stroke caused by cholesterol and triglycerides. Red wine, when combined with onions, can keep blood vessels soft. Black vinegar (aged vinegar) has the effect of softening red blood cells, and when combined with onion, it can unblock blood vessels more effectively.