一、引言在胃肠道管腔内环境中,酶活力十分丰富。活性酶直接分泌入肠道管腔内,并作用于腔道內容物。另外一些由肠绒毛细胞的刷状缘释放的酶其和底物则定位于肠腔內。除了大量的各色各样的内源酶外,宿主肠道的微生物系统在消化、改造和利用肠道内容物方面也十分活跃。过去,饭后的腹部症状常常归咎于日常饮食的消化不良。但可以设想消化酶的缺乏是吃了过量的一般性食物或脂肪性食物后产生疾病症状的基础。另外,还设想上了年纪的人患有 I. Introduction In the gastrointestinal lumen environment, the enzyme activity is very rich. The active enzyme is secreted directly into the intestinal lumen and acts on the contents of the lumen. Other enzymes and substrates released by the brush border of the villus cells localize in the intestine. In addition to the large variety of endogenous enzymes, the host gut microbiological system is also very active in digesting, modifying and using the intestinal contents. In the past, abdominal symptoms after a meal were often attributed to indigestion of the daily diet. However, it is conceivable that the lack of digestive enzymes is the basis for the onset of disease symptoms after eating excessive amounts of general foods or fatty foods. In addition, we think that we have elderly person