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粗纤维食物,吃得越多越好吗?实际上,人们存在种种误解。如今提倡高纤维膳食,据说有健康肠道、预防便秘等功效。例如疯传的魔芋减肥法,就号称高纤维。事实究竟怎样?李祥教授告诉记者,膳食纤维泛指植物性食物中不能被人体消化的多糖类物质。包括木质素、纤维素、半纤维素、果胶、抗性淀粉、抗性糊精、低聚糖、寡聚糖等。从消化角度看,膳食纤维属于食物中无效的成分,除了部分可以被肠道细菌利用外,大部分在胃肠道中旅游一趟后即排出体外。
Crude fiber foods, the more you eat the better? In fact, there are all kinds of misunderstandings. Now advocate a high-fiber diet, is said to have healthy bowel, prevention of constipation and other effects. For example, crazy pass konjac diet, known as high fiber. The fact that how? Professor Li Xiang told reporters that dietary fiber refers to plant foods can not be digested in human polysaccharides. Including lignin, cellulose, hemicellulose, pectin, resistant starch, resistant dextrins, oligosaccharides, oligosaccharides and the like. From the digestive point of view, dietary fiber is an ineffective ingredient in food, except that some can be used by intestinal bacteria, the majority of travel in the gastrointestinal tract after excretion.