The symptoms of lactose intolerance change with the consumed lactose content, the degree of lactase deficiency, the adaptability of intestinal microbes and whether there are other ways to supplement lactase. Drinking yogurt fermented by probiotics such as Lactobacillus acidophilus and Bifidobacterium is helpful for lactose digestion and can greatly alleviate lactose intolerance. Probiotics such as Lactobacillus acidophilus can induce the synthesis of β -galactosidase in the presence of lactose, which is beneficial to the decomposition and utilization of lactose..