If you are a straightforward book, then I want to say that it seems that every sentence is true and it is confusing to read. There are many books about health and longevity in the bookstore, which are taken out of context from ancient books and are often extreme. If you really want to understand the mystery of life, I suggest you read some original ancient books, but you still have to rely on yourself to understand them, such as Huangdi Neijing. Compendium of Materia Medica and so on, books about Chinese medicine and health preservation are really profound. You will gradually understand the mystery, but unfortunately, the world only pays attention to money and pays too little attention to life.