Diet and health. In the course of TCM health preservation and sub-health prevention, the practical content that students are most interested in is diet health preservation, and moderation in diet health preservation is the most basic and important one. Good quality food has a very obvious health care effect on human body. The course "TCM Health Preservation and Sub-health Prevention" is a large-scale open online course of China University and the first massive open online course and national-level excellent online course opened by Jinan University in 201715.