Effect of individual components of soy formula and cows milk formula on zinc bioavailability
Zinc absorption from human milk, cows milk formulas, and soy formulas was studied in human adults by a radioisotope technique using /sup 65/Zn and whole body counting. Individual dietary components were investigated for effects on zinc absorption. Phytate was found to have a strong inhibitory effect on zinc absorption; addition of phytate to cows milk formula (yielding a phytate concentration similar to that of soy formula) resulted in a decrease in zinc absorption from 31 to 16% similar to the absorption for soy formula (14%). Carbohydrate source, calcium, and zinc levels of the diet did not affect zinc absorption significantly. Iron supplementation of cows milk formula decreased zinc absorption from 24 to 18% although this decrease was not found to be significant (p less than 0.1). Absorption of zinc from a whey-adjusted cows milk formula was higher (31%) than from a nonmodified cows milk formula (22%). Increasing the zinc supplementation level in cows milk formula but not in soy formula increased zinc absorption to approximate that from breast milk. It is suggested that reduction of phytate content of soy formula may be a more effective avenue of modification than increased level of zinc supplementation.
- Research Organization:
- Univ. of California, Davis
- OSTI ID:
- 5974441
- Journal Information:
- Am. J. Clin. Nutr.; (United States), Vol. 40:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
MILK
BIOLOGICAL EFFECTS
SOYBEANS
ZINC
BIOLOGICAL AVAILABILITY
INTESTINAL ABSORPTION
CALCIUM
CARBOHYDRATES
CATTLE
COMPARATIVE EVALUATIONS
DIET
INHIBITION
IRON
LABELLED COMPOUNDS
MAN
PHYTIC ACID
RESPONSE MODIFYING FACTORS
TRACER TECHNIQUES
WHEY
WHOLE-BODY COUNTING
ZINC 65
ABSORPTION
ALKALINE EARTH METALS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BODY FLUIDS
COUNTING TECHNIQUES
DAYS LIVING RADIOISOTOPES
DOMESTIC ANIMALS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
ESTERS
EVEN-ODD NUCLEI
FOOD
INDUSTRIAL WASTES
INTERMEDIATE MASS NUCLEI
ISOTOPE APPLICATIONS
ISOTOPES
MAMMALS
MATERIALS
METALS
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHORIC ACID ESTERS
PLANTS
PRIMATES
RADIOISOTOPES
RUMINANTS
TRANSITION ELEMENTS
UPTAKE
VEGETABLES
VERTEBRATES
WASTES
ZINC ISOTOPES
560306* - Chemicals Metabolism & Toxicology- Man- (-1987)
550501 - Metabolism- Tracer Techniques