hu wen: professor, master tutor, vice president of chinese geriatric society, president of nutrition and food safety branch of chinese geriatric society. director of clinical nutrition quality control center of sichuan province, director of clinical nutrition department of west china hospital of sichuan university, academic and technical leader of health science and technology nutrition and food hygiene in sichuan province. he is currently the executive director of the chinese nutrition society, the vice chairman of the nutrition and metabolism management committee of the china association for the promotion of international exchanges in health care, the vice chairman of the nutrition medicine committee of the chinese society of research hospitals, the member of the national special diet standardization technical committee, and the leader of the sampling and testing of special medical formula food and special dietary food of the state food and drug administration analysis expert committee member, national clinical nutrition professional quality control center expert committee member, etc.