The Effect of Dietary Calcium Levels on Fecal Steroid Excretion in Rats.

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  • MIURA Tsutomu
    Department of Nutrition, Faculty of Agriculture, Tokyo University of Agriculture
  • UEHARA Mariko
    Department of Nutrition, Faculty of Agriculture, Tokyo University of Agriculture
  • SUZUKI Kazuharu
    Department of Nutrition, Faculty of Agriculture, Tokyo University of Agriculture
  • GOTO Shiro
    Department of Nutrition, Faculty of Agriculture, Tokyo University of Agriculture

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  • 食事性カルシウムレベルがラットの糞便中ステロイド排せつに及ぼす影響について
  • ショクジセイ カルシウム レベル ガ ラット ノ フンベンチュウ ステロイド

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Abstract

The effect of dietary calcium levels on fecal steroid excretion was examined in four-week-old male rats. We studied rats fed three levels of calcium (0.5, 1.0 and 1.5g/100g diet) with a 5.0% dietary lipid content. It was shown that increasing the calcium level in the diet increased fecal dry weight and decreased the gastrointestinal transit time. The daily fecal excretion of total lipids and cholesterols was increased by dietary calcium supplementation, but daily fecal excretion of total bile acids was not affected. These results suggest that high dietary calcium inhibits the absorption and reabsorption of total lipids and cholesterols in the gastrointestinal tract, but does not inhibit excretion total bile acids.

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