Apparent Small Intestinal Absorption of Nitrogen and Minerals from Soy and Meat-Protein-Based Diets. A Study on Human Ileostomy Subjects

• Published in: The Journal of nutrition Vol. 116; no. 11; pp. 2209 - 2218
• Main Authors: Sandström, Brittmarie, Andersson, Henrik, Kivistö, Barbro, Sandberg, Ann-Sofie
• Format: Journal Article
• Language: English
• Published: Bethesda, MD Elsevier Inc 01.11.1986; American Society for Nutritional Sciences
• Subjects: ABSORCION; ABSORPTION; ACIDE PHYTIQUE; ACIDO FITICO; ADU; ADUL; Adult; adults; ALMIDON; AMIDON; animal proteins; Animals; apparent absorption; AZOTE; Biological and medical sciences; diet; DIETA; Dietary Fiber; Dietary Fiber - metabolism; Dietary Proteins; Dietary Proteins - metabolism; Female; Fundamental and applied biological sciences. Psychology; Glycine max; Humans; Ileostomy; ileostomy subjects; INTESTIN; Intestinal Absorption; Intestine. Mesentery; INTESTINOS; Iron; Iron - metabolism; Male; Meat; metabolism; Middle Aged; MINERALES; minerals; Minerals - metabolism; MINERAUX; nitrogen; Nitrogen - metabolism; NITROGENO; NSOJA; OPERACIONES QUIRURGICAS; OPERATION CHIRURGICALE; phytic acid; Phytic Acid - metabolism; Plant Proteins, Dietary; Plant Proteins, Dietary - metabolism; PROTEINAS DE ORIGEN ANIMAL; PROTEINAS VEGETALES; PROTEINE ANIMALE; PROTEINE VEGETALE; REGIME ALIMENTAIRE; small intestine; SOJA; soy protein; Soybean Proteins; Soybeans; starch; Starch - metabolism; starch absorption; Vertebrates: digestive system; Zinc; Zinc - metabolism; minerals; ileostomy subjects; phytic acid; nitrogen; soy protein; apparent absorption; starch absorption; Human; Soy protein; Ileostomy; Absorption; Starch; Nitrogen compounds; Nitrogen; Inorganic element; Small intestine; Phytic acid
• ISSN: 0022-3166; 1541-6100
• DOI: 10.1093/jn/116.11.2209

The apparent absorption of nitrogen and minerals was studied in 8 ileostomy subjects. Four different test diets containing 60 g of meat, rice and bread protein, or a 25% replacement of the protein with soy flour, soy concentrate or soy isolate, were randomly assigned to the subjects in 2-d periods. All animal protein was replaced by soy isolate for a fifth 2-d period in two of the subjects. Ileostomy contents were collected in 2-h intervals during the day and in one portion during night and immediately deep-frozen. The fiber components and the phytic acid in the diet were almost completely recovered in the ileostomy contents, whereas unabsorbed starch was less than 2% of the intake. A significantly lower protein digestibility was observed when the diets containing soy protein were fed. No difference in protein digestibility was found between the different soy protein products. A 25% replacement by soy protein had no obvious effect on apparent mineral absorption. A low protein digestibility was also observed when soy was the main source of protein, and a negative apparent absorption of zinc was found in both subjects. Although 25% of soy protein in the diet does not seem to impair mineral absorption significantly, small intestinal net absorption of nitrogen is less from the soy diets than from the meat diet.