Kefir is also commonly referred to as yogurt. As for liquid, it refers to yogurt drinks, which are different from yogurt.

Yoghurt and yogurt drinks are not the same thing. Professor Zhang Jiazhi of the Beijing Food Research Institute said that the nutritional value of yogurt and yogurt drinks is very different. Professor Zhang said that yogurt is made from high-quality milk fermented by lactic acid bacteria and essentially belongs to the category of milk; yogurt drinks, also known as lactic acid drinks, are just a type of beverage and are no longer milk. Therefore, the nutritional content of the two is very different. The nutrition of yogurt drink is only 1/3 of that of yogurt. Yogurt preserves all the nutrients in fresh milk. During the fermentation of milk, lactobacilli decompose the protein and lactose in the milk, which is not only easy for the human body to digest and absorb, but also effectively inhibits the growth of bacteria in the intestines, which is helpful for the development of children's brain and nervous system. The nutritional content of yogurt drinks is far less than that of yogurt. According to the regulations of the dairy industry, 100 grams of yogurt requires a protein content of ≥2.9 grams, while the protein content of yogurt drinks is only about 1 gram. There is also a significant difference in the content of main ingredients between yogurt drinks and yogurt. Professor Zhang said that active lactic acid bacteria are not only the core ingredient that distinguishes yogurt from ordinary milk, but also the main ingredient that distinguishes yogurt from yogurt drinks. Active lactic acid bacteria are responsible for decomposing substances that are beneficial to the human body, and have various health effects such as promoting the absorption of nutrients and regulating gastrointestinal function. Moreover, its content directly determines the quality of yogurt. Ordinary yogurt drinks only contain lactic acid and do not contain active lactic acid bacteria that can ferment. Although a few varieties of yogurt drinks also contain active lactic acid bacteria, the content is very small. For people who lack lactase and are prone to bloating and diarrhea after drinking fresh milk, drinking yogurt is a good choice. But yogurt is by no means more, the better, and it is not suitable for babies, because yogurt is only equivalent to the nutritional content of milk and cannot meet the nutritional needs of babies. It is best for babies to eat specially formulated infant formula suitable for their age. For children, drinking 1-2 cups of yogurt every day, about 300 ml is enough. You need to be so cautious when drinking yogurt, and you should not be blind when drinking yogurt drinks. Yogurt drinks can be used to relieve heat and quench thirst, but their nutritional content is very low and cannot replace milk and yogurt, especially yogurt drinks made with sugar and water. Therefore, pregnant women and infants should choose carefully.