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Influences on the manganese intake, excretion and balance of adults, and on the manganese concentration of the consumed food determined by means of the duplicate portion technique

Influences on the manganese intake, excretion and balance of adults, and on the manganese concentration of the consumed food determined by means of the duplicate portion technique

Trace Elements and Electrolytes 21(2): 68-77

ISSN/ISBN: 0946-2104

Manganese intake, excretion and balance were investigated in German adults with mixed and vegetarian diets as well as in breast-feeding and not breast-feeding women. The daily manganese consumption and excretion were related to time, location, gender and a manganese supplementation. In addition, in 1996, the manganese intake of the persons consuming a mixed diet in Germany (2.4 mg/day for women and 2.7 mg/day for men) was compared with that in Mexico (2.0 and 2.1 mg/day, respectively). Breast-feeding women ingested 2.3 mg Mn/day. The supplementation with 300 mug Mn/day increased the manganese intake by 10% in young non-nursing and by 15% in breast-feeding women. These values analyzed by means of the duplicate portion technique were well within the assessment of the German Society of Nutrition (DGE) and the estimated safe and adequate daily dietary intake (ESADDI) of the Food and Nutrition Board of the National Research Council (NRC) of the USA, both of which provisionally recommend 2-5 mg Mn/day for adults. However, in our studies, German vegetarians consumed with 5.5 mg Mn/day (women) and 5.9 mg Mn/day (men) more than twice as much as individuals with a mixed diet. The manganese balances were found to be mostly negative. From the results of our intake, balance and placebo-controlled, double-blind studies, we assessed the normative requirement for manganese at 15 mug/kg body weight/day or 1 mg/day, as weekly average. Therefore, we recommend a mean intake of 30 mug Mn/kg body weight/day or 2 mg Mn/day, which we consider to be sufficient intake values for adult humans. The type of diet, year, gender, country, location and partly the Mn supplementation were found to have a statistically significant influence on daily manganese intake, whereas, interestingly, the concentration of consumed food was not influenced by gender. Though manganese is an essential trace element, manganese deficiency symptoms were not recognized in humans under healthy conditions and balanced nutrition.

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Accession: 012212703

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