膳食纤维是一种天然有机高分子化合物,一种复杂的不能被人体消化酶分解,但又是维持健康不可缺少的碳水化合物.被称为第七营养素。它包括纤维素、半纤维素、果胶,木质素、藻胶等。人们对膳食纤维的作用,认识一直是较肤浅的,认为除有缓解便秘作用外,对人体别无益处。但上世纪60年代末从广泛的营养调查中发现,食用加工过于精细的食品的国家 Dietary fiber is a kind of natural organic polymer compound, a complex carbohydrate that can not be decomposed by human digestive enzymes but is indispensable for maintaining health. It is called the seventh nutrient. It includes cellulose, hemicellulose, pectin, lignin, alginate and the like. People’s understanding of the role of dietary fiber has always been more superficial, that in addition to relieve the role of constipation, the body does not help. However, extensive nutritional surveys in the late 1960s found that countries that processed food that was too fine