I have a roommate. According to a conservative estimate, he can fart more than 20 times a day, and all of them are loud. What are the principles and reasons?

Indigestion caused by wolfing down food.

There are two main sources of fart, one is swallowing air, and the other is that some indigestible carbohydrates are digested by bacteria to produce excess gas. The main component of air swallowed by individuals is nitrogen, while the gas produced by bacterial fermentation is mainly hydrogen. In addition, about one-third of fart components belong to "methane", which is mainly produced in the large intestine.

The common foods that cause bacterial fermentation to produce gas are lactose, maltose, fructose, beer, beans, bananas, corn, white radish, potatoes, eggs, and even barley and oats. If abdominal distension is accompanied by diarrhea or even weight loss in clinic, it is necessary to consider whether there is potential indigestion.

Individuals who often fart should try to avoid eating foods containing lactose in their daily diet. In some cases with serious symptoms, they must even avoid eating fructose and fruits and vegetables containing crude fiber.