Drinking fermented milk and milk containing bifidobacteria is good for the gastrointestinal system. Milk contains a lot of lactose, and many people will have symptoms of lactose deficiency in their bodies, and because of the inability to completely break down and absorb lactose, many people will experience bloating and diarrhea as a result. When drinking milk it is best to ferment the milk, after fermentation the milk lactase can be degraded, so it will not cause irritation to the gastrointestinal system, and at the same time the milk will produce a large number of lactic acid bacteria after fermentation, which can improve the intestinal micro-ecological environment and promote the recovery of intestinal function. Some milk is processed with bifidobacteria, which are rich in galactosidase and can help improve the symptoms caused by lactase deficiency, while bifidobacteria can also improve intestinal function and are a kind of intestinal beneficial bacteria. While drinking milk you should also be careful to avoid the fasting state, it is best to drink it with pasta, which can dilute the lactose in the milk and reduce the symptoms of lactose intolerance.