The effect of soy products in the diet on retention of non-heme iron from radiolabeled test meals fed to marginally iron-deficient young rats
Diets based either on casein or soy products and containing about 25 ppm iron were fed to weanling rats for 13 days. Rats were fasted overnight and fed a {sup 59}Fe-radiolabeled casein test meal the morning of day 14. On day 21 less {sup 59}Fe was retained by rats fed various diets based on selected soy products than by rats fed the casein-based diet. A similar adverse effect of diet components on {sup 59}Fe retention from a casein test meal was observed for lactalbumin and for psyllium husk. No adverse effect of diet on {sup 59}Fe retention was observed for the fiber of soy cotyledons or for rapeseed protein concentrate. For a commercial soy protein isolated (SPI) fed throughout the 21-day experiment, the adverse effect of diet on {sup 59}Fe retention was observed to the sum of the effect of dietary SPI previous to the {sup 59}Fe-radiolabeled casein test meal fed on day 14 and the effect of dietary SPI subsequent to the casein test meal. An effect of dietary soy products on {sup 59}Fe retention from a casein test meal was not observed with diets containing higher iron levels (83 ppm) or when diets were fed for a longer period prior to the test meal (56 days). The present work shows that in some circumstances the concept of iron bioavailability must be expanded to include not only the influence of meal composition, but also the influence of diet previous to and subsequent to a meal.
- Research Organization:
- Illinois Univ., Urbana, IL (USA)
- OSTI ID:
- 6974557
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Aqueous ethanol extraction of dietary soy protein isolate improves sup 59 Fe absorption by the rat from a casein-based test meal
Iron bioavailability studies as assessed by intrinsic and extrinsic labeling techniques
Related Subjects
CASEIN
INGESTION
IRON 59
RETENTION
SOYBEANS
ANIMAL FEEDS
BIOLOGICAL AVAILABILITY
DIET
IRON COMPOUNDS
LABELLED COMPOUNDS
PHYSIOLOGY
RATS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
EVEN-ODD NUCLEI
FOOD
INTAKE
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOTOPES
MAMMALS
NUCLEI
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PLANTS
PROTEINS
RADIOISOTOPES
RODENTS
TRANSITION ELEMENT COMPOUNDS
VEGETABLES
VERTEBRATES
551001* - Physiological Systems- Tracer Techniques