Personally, I think that natural health preservation should be the way to survive, and the purpose of health preservation should follow the objective laws of nature and conform to the theory of time, place and gossip of Yin and Yang. This period also includes eating naturally grown food, absorbing the essence of heaven and earth, and being influenced by the cosmic gas field. In short, all health preserving methods based on conforming to the laws of nature are called natural health preserving.