Effect of soy protein isolate in the diet on retention by the rat of iron from radiolabeled test meals
The influence of soy protein isolate (SPI) in the diet on whole-body retention of extrinsically radiolabeled iron from test meals containing or not containing SPI was evaluated in marginally iron-deficient weanling rats. In experiment 1 SPI was compared with casein in a 2 X 2 factorial design: diets and test meals were either SPI-based or casein-based. Diets were fed for 13 days prior to the test meal and for 7 days subsequent to the test meal. Rats fed the SPI-based diet retained less iron from test meals than did rats fed the casein-based diet (66.1 vs. 74.8%, P less than 0.01). Experiment 2 showed that an SPI-based diet fed during the final 4 days of a 14-day pre-test meal period and subsequent to the test meal led to less iron retention compared to a casein-based diet. In addition to the observed diet effect, experiment 1 showed that iron retention was less from an SPI-based test meal than from a casein-based test meal, confirming previous reports of adverse effects of SPI on iron retention. The present experiments show that SPI can adversely affect from retention in two ways: by its presence in the diet before and after a test meal, and by its presence in a test meal.
- Research Organization:
- Univ. of Illinois, Urbana
- OSTI ID:
- 6747417
- Journal Information:
- J. Nutr.; (United States), Journal Name: J. Nutr.; (United States) Vol. 114:2; ISSN JONUA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
560305 -- Chemicals Metabolism & Toxicology-- Vertebrates-- (-1987)
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
DIET
ELEMENTS
FOOD
IRON
IRON ISOTOPES
ISOTOPES
MAMMALS
METALS
NUTRIENTS
ORGANIC COMPOUNDS
PROTEINS
RATS
RETENTION
RODENTS
SOYBEANS
TRANSITION ELEMENTS
VEGETABLES
VERTEBRATES