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膳食纤维(DF)对维护人的消化道功能和结构有重要作用。现代的DF定义强调食物中DF对人体的营养价值,将生理学功能相似的物质均归为DF,即不能在小肠内消化吸收、可进入结肠发酵的物质,故包含一些既往不被认为是DF的物质,如低聚糖、抗性淀粉、不能被消化的单糖、双糖等。婴儿肠道功能发育不成熟,未完全消化吸收的糖类则可能进入结肠发酵发挥作用。乳汁中未能被消化吸收的乳糖、丰富的低聚糖或食物中未消化吸收的淀粉是小婴儿的DF来源。婴儿后期肠道功能逐渐发育成熟,肠道缺乏从乳类来的DF(主要是未消化的乳糖),食物中未消化吸收的淀粉减少,需要逐渐引入含一定量DF的半固体或固体食物,否则可发生便秘。
Dietary fiber (DF) plays an important role in maintaining human digestive tract function and structure. The modern definition of DF emphasizes the nutritional value of DF in human body. All substances with similar physiologic functions are classified as DF, that is, they can not be digested and absorbed in the small intestine and enter into the fermented substance in the colon. Therefore, DF contains some previously unknown DF Substances, such as oligosaccharides, resistant starches, monosaccharides that can not be digested, disaccharides and the like. Infant intestinal function immature, not completely digested and absorbed carbohydrates may enter the colon to play a role in fermentation. Lactose that is not digested and absorbed in milk, rich in oligosaccharides, or undigested starch in foods is the DF source for young infants. In the late stage of infancy, intestinal function gradually develops. The intestine lacks DF (mainly undigested lactose) from milk. The undigested starch decreases in food, and semi-solid or solid food containing a certain amount of DF needs to be introduced gradually. Otherwise constipation can occur.