Kien C L, Cordano A, Cook D A, Young V R
Am J Clin Nutr. 1981 Mar;34(3):357-61. doi: 10.1093/ajcn/34.3.357.
Fat and nitrogen absorption and fecal characteristics were studied in 10 healthy, young adults who ingested a free-choice diet for 12 days and then isocaloric amounts of one of two nutritionally complete liquid defined formula diets during a succeeding 12-day period. Apparent fat absorption was 98 to 99% of intake with both defined formula diets and 95% of intake on the free-choice diet. Nitrogen digestibility was determined during the liquid diet period, and averaged 95 to 98% of intake. There were no statistically significant differences between the liquid diets and the free-choice diets with respect to fecal wet or dry weight, transit time, or stool frequency. Individual stool weights averaged 83 to 96 g on the free-choice or liquid formula diets and were comparable to other values reported in the literature. These results support the theory that a critical volume of feces must accumulate in the colon before defecation occurs, regardless of diet composition.
对10名健康的年轻成年人进行了脂肪和氮吸收以及粪便特征的研究。这些受试者先自由选择饮食12天，然后在接下来的12天里摄入两种营养完全的液体配方饮食中的一种等热量饮食。两种配方饮食的表观脂肪吸收率为摄入量的98%至99%，自由选择饮食的表观脂肪吸收率为摄入量的95%。在液体饮食期间测定了氮消化率，平均为摄入量的95%至98%。在粪便湿重或干重、通过时间或排便频率方面，液体饮食和自由选择饮食之间没有统计学上的显著差异。自由选择饮食或液体配方饮食时，个体粪便重量平均为83至96克，与文献中报道的其他值相当。这些结果支持了这样一种理论，即无论饮食组成如何，在排便发生之前，结肠中必须积累一定体积的粪便。
