People's digestive and metabolic function mainly depends on the decomposition and transportation of the spleen and stomach, which is called the foundation of the day after tomorrow. For example, Huangdi Neijing said: "The stomach belongs to the sea of five zang-organs and Shui Gu enters the stomach, and all the five zang-organs are full of qi in the stomach", which means that all the viscera, organs and tissues of the human body need all kinds of nutrients supplied by the spleen and stomach, which are the source of life for health preservation or treatment. 57, refers to 35 years old, which coincides with middle age, indicating that digestive and metabolic functions began to decline after middle age.

Modern medicine believes that after entering middle age, women's digestive function and metabolic rate decrease obviously. Around the age of 30, the secretion of digestive juice such as gastric juice is obviously reduced, and the effective components such as digestive enzymes are also reduced. After the age of 50, the digestive ability can be reduced by as much as 2/3. Basal metabolism decreased at an average rate of 0.5% per year. For example, the basal metabolic rate of men aged 365,438+0 ~ 40 is 379 calories per square meter of body surface area per hour. 4 1 ~ 50 years old, down to 368 kcal; 5 1 year-old population, down to 356 calories. Women are inferior to men. Middle-aged people's taste is getting worse and worse, the taste buds on the tongue coating decrease, and the enamel on the tooth surface wears away with age. Some people have analyzed that if you lose two teeth at the age of 30, seven teeth at the age of 40-50, and eight teeth at the age of 60, it will affect the chewing function.