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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 351983
Title Phytate intake and molar ratios of phytate to zinc, iron and calcium in the diets of people in China
Author(s) Ma, G.; Li, Y.; Jin, Y.; Zhai, F.; Kok, F.J.; Yang, X.
Source European Journal of Clinical Nutrition 61 (2007). - ISSN 0954-3007 - p. 368 - 374.
Department(s) Chair Nutrition and Health over the Lifecourse
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) magnetic-resonance spectroscopy - vegetarian trappist monks - phytic acid - inositol phosphates - nutritional-status - millimolar ratios - absorption - bioavailability - foods - humans
Abstract Objective: To assess the phytate intake and molar ratios of phytate to calcium, iron and zinc in the diets of people in China. Design: 2002 China Nationwide Nutrition and Health Survey is a cross-sectional nationwide representative survey on nutrition and health. The information on dietary intakes was collected using consecutive 3 days 24|[thinsp]|h recall by trained interviewers. Subjects: The data of 68|[thinsp]|962 residents aged 2|[ndash]|101 years old from 132 counties were analyzed. Results: The median daily dietary intake of phytate, calcium, iron and zinc were 1186, 338.1, 21.2 and 10.6|[thinsp]|mg, respectively. Urban residents consumed less phytate (781 vs 1342|[thinsp]|mg|[sol]|day), more calcium (374.5 vs 324.1|[thinsp]|mg|[sol]|day) and comparable amounts of iron (21.1 vs 21.2|[thinsp]|mg|[sol]|day) and zinc (10.6 vs 10.6|[thinsp]|mg|[sol]|day) than their rural counterparts. A wide variation in phytate intake among residents from six areas was found, ranging from 648 to 1433|[thinsp]|mg|[sol]|day. The median molar ratios of phytate to calcium, iron, zinc and phytate |[times]| calcium|[sol]|zinc were 0.22, 4.88, 11.1 and 89.0, respectively, with a large variation between urban and rural areas. The phytate:zinc molar ratios ranged from 6.2 to 14.2, whereas the phytate |[times]| calcium|[sol]|zinc molar ratios were from 63.7 to 107.2. The proportion of subjects with ratios above the critical values of phytate to iron, phytate to calcium, phytate to zinc and phytate |[times]| calcium|[sol]|zinc were 95.4, 43.7, 23.1 and 8.7|[percnt]|, respectively. All the phytate|[sol]|mineral ratios of rural residents were higher than that of their urban counterparts. Conclusions: The dietary phytate intake of people in China was higher than those in Western developed countries and lower than those in developing countries. Phytate may impair the bioavailability of iron, calcium and zinc in the diets of people in China
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