Dietary Intake, Absorption and Balance of Calcium, Phosphorus and Magnesium in Eldery People.

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  • Okuda Toyoko
    Department of Food and Nutrition, Faculty of Human Life Science, Osaka City University
  • Miyoshi-Nishimura Hiroko
    Department of Food and Nutrition, Faculty of Human Life Science, Osaka City University
  • Matsudaira Toshiko
    Department of Food and Nutrition, Faculty of Human Life Science, Osaka City University
  • Koishi Hideo
    Department of Food and Nutrition, Faculty of Human Life Science, Osaka City University
  • Fujita Daisuke
    Kyoto Interdisciplinary Institute of Community Medicine

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  • 高齢者におけるカルシウム，リン，マグネシウムの吸収率と出納
  • コウレイシャ ニ オケル カルシウム リン マグネシウム ノ キュウシュウリツ

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The calcium, phosphorus and magnesium status of elderly people was studied on 23 healthy men (74.1±2.9 years old, mean±SD) and 16 healthy women (71.9±2.5 years old) living in Kyoto. We carried out balance studies and dietary surveys by the weighing method for three consecutive days. The mean daily intakes of energy and nutrients fulfilled the recommended dietary allowance for the Japanese of their sex, age, weight and degree of physical activities except for women's iron. The mean daily intakes of calcium, phosphorus and magnesium for men per kilogram of body weight were 10.7±4.4, 18.7±4.8 and 3.62±1.30mg respectively. For women, the mean daily intakes of calcium, phosphorus and magnesium were 11.2±5.0, 18.4±4.0 and 4.05±1.42mg respectively. One fourth of the calcium intake came from milk, milk products and other sources such as shellfish, legumes and vegetables. The apparent absorption of calcium, phosphorus and magnesium were significantly correlated with fecal dry weight. Women's absorption rate of calcium (2±38%) was lower than men's (23±30%). The mean calcium balance was approximately at equilibrium (-0.6±3.0mg/kg) for men and negative (-1.8±4.1mg/kg) for women. The apparent absorption rate of phosphorus was about 60%, indicating that phosphorus was approximately balanced in both sexes. The apparent absorption rate of magnesium was about 15% in both sexes.

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