2016年底,我国≥60岁人口数已达2.31亿,其中≥65岁老年人群为1.5亿,占总人口的10.8%。到2050年,我国老年人群将达4.83亿,占全人口的34.1%;≥80岁的高龄老年人群也将达到1亿。受生理机能减退或失能、易患病、病程长、病种复杂等多种因素影响,我国老年人群存在营养缺乏与营养过剩的双重问题。2012年中华医学会肠外肠内营养学分会全国老年住院患者营养调查结果显示: By the end of 2016, the number of people ≥60 years old in our country has reached 231 million, of which 150 million are aged 65 or older, accounting for 10.8% of the total population. By 2050, China’s elderly population will reach 483 million, accounting for 34.1% of the total population; ≥ 80-year-old elderly population will reach 100 million. Influenced by many factors, such as hypogonadism or disability, susceptible to illness, long course of disease and complex disease types, the elderly in China have the dual problems of nutritional deficiencies and overnutrition. 2012 Chinese Medical Association of parenteral enteral nutrition branch of the national elderly inpatient nutritional survey results show: