Urinary Calcium and Calcium Balance in Young Women Affected by High Protein Diet of Soy Protein Isolate and Adding Sulfur-Containing Amino Acids and/or Potassium

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概要

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• The effects of sulfur-containing amino acids (SAA) and potassium (K) on urinary excretion and retention of calcium (Ca) of 27 young Japanese women were studied. A basal diet low in protein level (50g per day) was fortified by meat or soy protein isolate (SPI) to a protein level of 100g per day, and effects of addition of apple to these high protein diets, and addition of SAA and/or potassium (K) to the high SPI diet, especially on urinary Ca excretion, were studied. The addition of meat which increased protein intake to 100g caused the increase in apparent absorption and urinary excretion of Ca with increased excretion of urinary sulfur (S), phosphate, ammonia, and titratable acids (TA), whereas addition of SPI did not. The addition of apple to high meat diet decreased absorption and urinary excretion of Ca. Urinary Ca, S, K, ammonia, and TA excretion increased by the addition of SAA to high SPI diet in a manner similar to the meat diet. Consequently, SAA-supplemented diet had a significantly negative effect on Ca retention. In SPI+SAA, K diet period, urinary K excretion markedly increased, and increments in urinary Ca, ammonia, and TA excretion were reversed. These changes observed in SPI+SAA, K diet period were similar to those by adding apple to meat diet without any effect on Ca absorption. The results suggest that the hypercalciuria induced by high meat diet is mainly caused by high content of SAA and may be reversed by the ingestion of K-rich foodstuffs, and soy protein does not induce hypercalciuria because of it contains less SAA than animal protein.

著者

• 小池 五郎

  Kagawa Nutrition College

• 愛敬 光代

  Kagawa Nutrition College, Cliiyoda, Sakado

• 金子 佳代子

  Faculty of Eduction, Yokohama National University

• 正木 うらら

  Kagawa Nutrition College, Cliiyoda, Sakado

• 矢吹 恵子

  Kagawa Nutrition College, Cliiyoda, Sakado

• 芳賀 綾子

  Kagawa Nutrition College, Cliiyoda, Sakado

• 的場 千夏

  Kagawa Nutrition College, Cliiyoda, Sakado

• 佐々木 裕美

  Faculty of Eduction, Yokohama National University

• 金子 佳代子

  Faculty of Education, Yokohama National University

関連論文

• Obligatory N Loss and Utilization of Egg and Rice Mixed Protein in Young Japanese Women
• Urinary Calcium and Calcium Balance in Young Women Affected by High Protein Diet of Soy Protein Isolate and Adding Sulfur-Containing Amino Acids and/or Potassium
• Utilization of soy protein isolate mixed with rice protein in Japanese women.
• Effect of protein intake level on urinary energy/nitrogen ratio in Japanese.
• Utilization and requirement of egg protein in Japanese women.
• Effect of fiber on protein, fat and calcium digestibilities and fecal cholesterol excretion.
• Utilization and requirement of dietary protein taking into account the dermal and miscellaneous nitrogen losses in Japanese women.
• Effect of methionine supplementation of a soy protein isolate on short-term nitrogen balance in young women.

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