Flynn M A, Gehrke C, Maier B R, Tsutakawa R K, Hentges D J
J Am Diet Assoc. 1977 Nov;71(5):521-6.
Calculated and chemically analyzed nutrient values for three weighed constant diets were dissimilar for calcium, magnesium, protein, and fat, and similar for fiber and ash. Fecal nutrient concentrations of ten healthy men fed the same constant diets were quite variable. Feeding constant weighed diets of similar composition does not assure the same fecal residue in the large colon of human subjects.
三种称重恒定饮食的计算和化学分析营养素值在钙、镁、蛋白质和脂肪方面存在差异，而在纤维和灰分方面相似。食用相同恒定饮食的十名健康男性的粪便营养素浓度差异很大。提供组成相似的恒定称重饮食并不能确保人类受试者大肠中的粪便残渣相同。
