Effect of diet on fecal nutrients

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.