Chinese medicine believes that people's mental activities are closely related to the occurrence of diseases. For example, in Huangdi Neijing, "Anger hurts the liver, fear hurts the kidney, thinking hurts the spleen and mourns the lungs", which shows that bad emotions can cause diseases. Changle is a positive emotion, which can improve the vitality of human brain and the whole nervous system, keep the balance of endocrine, give full play to the potential ability of the whole body, and make people energetic and healthy. Huangdi Neijing said: "Eat its beauty, make it serve it, enjoy its vulgarity, do not envy each other when arguing, and it will be simple when you die." This sentence means that people feel delicious no matter what food they eat, and they are satisfied no matter what clothes they wear. Everyone loves their own customs, lives happily, and does not admire each other regardless of their social status, so these people can be called unpretentious. What it wants to express is that people should be satisfied. There are similar expressions in Yan Jinming Dan, such as "Why should Dongyuan be craggy", "Why should you wear fine silk clothes", "Why should you eat with geese", "Why should you marry" and "Why should you raise a child to finish the exam?"

Contentment refers to the adaptation and satisfaction to real life. "Being content with Changle" seems simple, but it contains healthy philosophy. The definition of health by the International Health Organization is: "Health is not only the absence of disease and weakness, but the perfect state of physical health, mental health and social adaptation." Contentment is the full expression of mental health and social adaptation. "Contentment" is actually about mental health. Although everyone knows that "contentment is always happy", it is often an "insurmountable gap". Let's look at the ancients. In Qian Ben Cao, the description of money is incisive: "Money is sweet, hot and poisonous. Can benefit the country, pollute the virtuous, and fear honesty. Greedy people take it, just flatten it. If it is uneven, it will be cold and hot. This is cholera. " Therefore, we should treat money as blind medicine and use it carefully.