[Phytate][calcium]/[zinc] ratios in Asian immigrant lacto-ovo vegetarian diets and their relationship to zinc nutriture. [English]
1986
Bindra G.S. | Gibson R.S. | Thompson L.U.
Extract: Lacto-ovo vegetarians often have low zinc intakes coupled with concomitant high intakes of dietary fiber, phytate and calcium. The latter two dietary components appear to exert a synergistic inhibitory effect on zinc absorption. In this study 30 1-day diet composites were prepared for analysis from 3-day weighed diet records completed by 112 Asian immigrants consuming predominantly lacto-ovo vegetarian diets and compared with 30 omniverous diet composites. Analysed mean (+/- S.D.) daily intakes were: energy (kcal) 1892+/-445, calcium (mg) 1093+/-467, zinc (mg) 8.5+/-4.5, phytate (mg) 1487+/-791, neutral detergent fiber (g) 26.8+/-13.2. Median phytate:Zn molar ratio for Punjabi diets was 17.7 (range=5-50) and median [phytate][Ca]/[Zn] molar ratio was 475.4 (range=48-1150) compared with median values of 8.3 and 130.9 respectively for omniverous diets. Thirty-seven percent of the Punjabi diets had phytate:Zn ratios greater than 20 and 80% had [phytate][Ca]/[Zn] ratios greater than 200, levels shown to jeopardize zinc status in man. Thirty-two percent of the Punjabi subjects had low serum zinc levels (ie less than 70 g/dl) which may be associated with the unusually high dietary [phytate][Ca]/[Zn] ratios. The latter are attributed to high intakes of unleavened wholemeal chapatti bread, dairy products, and low intakes of flesh foods.(author).
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