关键词: 膳食纤维, 营养素, 短链脂肪酸, 适宜摄入量, 肠道微生物, 胃肠道功能

Abstract: Dietary fibre，also known as the seventh nutrient，is a kind of carbohydrate that cannot be digested by the human gastrointestinal tract，but can be fermented by intestinal microbiota to produce short chain fatty acids，which plays an important role in improving intestinal function and maintaining body metabolism and health. At present，there is a lack of understanding of dietary fibre in the public and the amount of intake is significantly lower than the international recommended intakes. This article reviews the definition of dietary fiber，recommended intake，and the impact on human gastrointestinal tract and health，aiming to improve the understanding of dietary fiber and its role.

Key words: dietary fibre, nutrient, short chain fatty acids, appropriate intake, gut microbiota, gastrointestinal function