First of all, let's look at why it's called keeping in good health. In ancient times, keeping in good health depended on natural things. At that time, medicinal materials were also very expensive, but this was only on the one hand, and on the other hand, it was to do things like cultivate one's morality and raise one's health. Wu Chan also belongs to the same category, basically eating green food. So there is such an ingredient in it.
Then there is our modern medical care. Modern people pay more attention to the quality of health products. Health care products have certain functions to help us improve people's functions. In addition, modern young people don't use health care products very much, but they are also useful. Besides taking supplements and green food, young people will also do outdoor or indoor exercise to improve their physical function. The third aspect is the emergence of enlightenment and meditation as in ancient times to improve their self-cultivation and understand the way of life. This is my personal understanding and I hope it will help you.