Lactobacillus paracasei is a kind of probiotic bacteria, mainly exists in the human intestinal tract, has the function of enhancing immunity, maintaining the balance of intestinal flora, promoting digestion, etc. It also has the function of lowering blood pressure, lowering cholesterol, preventing cancer and inhibiting tumor growth, enhancing physical fitness, delaying aging and prolonging life, etc. It is also involved in digestion, promoting intestinal peristalsis, and can effectively prevent and treat constipation. Among the foods eaten daily, yogurt contains the largest amount of this probiotic bacteria, usually must drink yogurt in moderation every day, so that the body can absorb more Lactobacillus paracasei, so as to effectively ensure the health of the body. However, the shelf life of the yogurt must be watched, can not use the expired and deteriorated yogurt, otherwise not only can not play a good role, but will affect the health.