Often fart to defecate in time, and form a good habit of defecating after getting up in the morning. Shit is the most likely to cause fart, and fart is particularly smelly. Don't eat too fast. About 70% of the composition of fart is the air inhaled with food when eating. At the same time, the air swallowed by the mouth accounts for 70% of the waste gas components. People who gobble and eat fast are prone to fart. The secret of swallowing less air when eating is to increase the frequency of chewing, so that food and saliva can be fully mixed. When saliva and food are fully mixed, air is naturally discharged. Eating more digestible foods, less indigestible potatoes and beans, and more gas-producing foods can reduce the amount of waste gas by 2- 10 times. The amount of fart in Europe and America is very small, because the intake of dietary fiber is relatively small. On the contrary, the more meat you eat, the more smelly your fart is. People who are used to eating too much animal protein and fat in their diet should switch to foods rich in dietary fiber, such as root vegetables, potatoes, beans, seaweed, etc., to improve the bacterial environment in the intestines. When beneficial bacteria such as lactic acid bacteria increase, waste gas is easy to be discharged. On the contrary, when harmful bacteria increase, gas is not easy to be discharged. Avoid overeating, which will cause incompleteness or indigestion and produce waste gas. Foods that can eliminate waste gas in the body are: sweet potato and foods rich in lactic acid bacteria, such as yogurt, cheese, lactic acid bacteria drinks, cream, rye bread, soy sauce and so on.