To tell the truth, the best health book is Huangdi Neijing. But I don't think you understand. But if you want to know it well, you have to read it eventually. There is a vernacular. Go to Baidu Library to search.
I recommend you to read the three books in this series written by Baliren. Very good. Suitable for beginners.
Finally, I'll give you a general outline. If the body wants it, it depends on the meridians. Among them, spleen and stomach health is the key. The ultimate goal of promoting qi and blood stones.