有些小朋友吃饭时不爱吃蔬菜,这是一种不良的挑食行为。蔬菜除了富含维生素以外,还含有一类重要的物质——膳食纤维。膳食纤维在蔬菜、水果、粗粮等食物中含量丰富,主要来自植物的细胞壁,包含纤维素、半纤维素、树脂、果胶及木质素等。随着营养学的发展,人们逐渐发现膳食纤维具有相当重要的生理作用。因此,膳食纤维被称为第七类营养素,和传统的六类营养素——蛋白质、脂 Some children do not eat vegetables when eating, which is a bad picky eaters. In addition to vegetables rich in vitamins, vegetables also contain a class of important substances - dietary fiber. Dietary fiber in vegetables, fruits, coarse grains and other foods rich in content, mainly from plant cell walls, including cellulose, hemicellulose, resin, pectin and lignin. With the development of nutrition, people gradually find dietary fiber has a very important physiological role. Therefore, dietary fiber is called the seventh type of nutrients, and the traditional six types of nutrients - protein, fat