Multi-organ insufficiency syndrome in the elderly is an important cause of death in elderly patients with critical illnesses. The impairment of bodily functions leads to a decline in bodily functions, and the body’s ability to fight infections decreases, and geriatric multi-organ insufficiency syndrome is a manifestation of a decline in infection resistance. What is the dietary health care for declining resistance to infection? 1, reishi: reishi can enhance the body’s immunity, this is because reishi contains anti-cancer effectiveness of polysaccharides, in addition, also contains rich germanium elements. Germanium can accelerate the body’s metabolism, slow down the aging of cells, and can play its anti-cancer role by inducing the body to produce interferon; 2. 5, shiitake mushroom: shiitake mushroom polysaccharides contained in the shiitake mushroom can enhance the immunity of the body. The usual appropriate outdoor exercise to prevent colds. Whenever there is a change of season in winter, active protection for different conditions and susceptible groups of elderly people can be given in advance with nuclear cheese, globulin and flu vaccination. A new antigen-free bioimmunomodulatory stimulant, Bystam, has recently been introduced, which can enhance the chemotactic and bactericidal effects of macrophages, and enhance antibody and cellular immune functions, and has a significant preventive effect on recurrent respiratory tract infections.