Estimation of nutrients in diets from the values of carbon, nitrogen and hydrogen in diet and feces measured by CHN corder

人们认为营养素、能量和膳食纤维的摄入与许多成人疾病，特别是结直肠癌的发生密切相关。因此，营养调查是评价健康水平及其与疾病关系的重要手段。但是，膳食中营养素、能量和膳食纤维的官方测定方法成本高、耗时长，难以应用于公共卫生领域。本研究试图通过CHN-CORDER测得的膳食和粪便中的碳、氢和氮的值来估算膳食中的营养、能量和膳食纤维的值，并将CHN-C测定仪测得的碳、氢和氮的值与官方方法测得的碳水化合物、脂肪、蛋白质、能量和膳食纤维的值进行比较。然后，用CHN-Corder测得的碳氢氮值对公法测得的碳水化合物、脂肪、蛋白质、能量和膳食纤维的值进行推定代数表示。而营养、能量和膳食纤维的值与CHN-Corder测得的碳、氢和氮的值之间没有相关性。认为这是由于人类粪便中管腔内菌群和肠道分泌物中约有50%的原因造成的，这种方法非常方便，因为测量CHN-Corder的时间只有5分钟，适用于公共卫生领域。

It is thought that there are high relation between intake of nutrients, energy and dietary fiber and many adult diseases, especially colorectal cancer. Therefore, the nutrition survey is an important means of appraising the health standard and the relationship between and diseases. But, official measurement method for nutrient, energy and dietary fiber in diet was needed high cost and took time, so it was difficult to apply in area of public health. In this study, we attempted to estimate the values of nutrient, energy and doetary fiber in diet from the values of carbon, hydrogen and nitrogen in diet and feces measured by CHN-corder.We compared the values of carbon, hydrogen and nitrogen measured by CHN-corder to the values of carbohydrate, lipid, protein, energy and dietary fiber measured by official method. Then, we could make a presumption algebraic expression using the nalues of carbon, hydrogen and nitrogen measured by CHN-corder for the values of carbohydrate, lipid, protein, energy and dietary fiber measured by public method. On the other hand, there no relation betweenthe values of nutrient, energy and doetary fiber and the values of carbon, hydrogen and nitrogen measured by CHN-corder. It was thought that this reasonare about 50% in intraluminal flora and intestinal epithel in human feces.This method is very convinient, because the time of measurement CHN-corder was only 5 minitue, so it is useful to apply to area of public health.