Effects of Fish or Beef Ingestion in Common Japanese Diet with Low Dietary Linoleic Acid on Plasma and Erythrocyte Membrane Fatty Acid Composition in Young Adult Females.

  • IWATA Yukiko
    Division of Maternal and Child Health Science, National Institute of Health and Nutrition
  • NIIZEKI Shiro
    Division of Maternal and Child Health Science, National Institute of Health and Nutrition
  • KURODA Keiichi
    Department of Living of Science, Teikyo Junior College
  • TASHIRO Noriko
    Faculty of Human Life Sciences, Jissen Women University
  • URATA Gunpei
    Faculty of Human Life Sciences, Jissen Women University
  • TOTANI Masayuki
    Division of Maternal and Child Health Science, National Institute of Health and Nutrition

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Other Title
  • 若年成人女性の血しょうおよび赤血球膜中脂肪酸組成に及ぼす魚または牛肉を含む低リノール酸食摂取の影響
  • ジャクネン セイジン ジョセイ ノ ケッショウ オヨビ セッケッキュウ マクチ

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A study was done to evaluate the effects of two common Japanese diets, a fish-based diet and a beef-based diet, with a low linoleic acid (LA) content, on the fatty acid composition of both plasma and the erythrocyte membrane. Twelve healthy young adult female volunteers were divided into Group A (n=6) and Group B (n=6). Group A was first given the experimental fish diet (FD) for 5 days, followed by the beef diet (BD) for 5 days. The order was reversed for Group B. Blood samples were taken from each subject following an overnight fast on days 0, 5 and 10. The levels of plasma eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) did not change during the experimental BD period. However, a significant increase was observed during the period of FD ingestion. In contrast, the level of plasma LA decreased during the FD ingestion period, whereas no change was apparent during the BD ingestion period, despite low LA intake. The pattern of the change in the plasma fatty acid composition in Group A on day 5 was similar to that in Group B on day 10. However, despite the difference in the lipid composition of the respective diets, the fatty acid composition of the erythrocyte membrane did not differ between the groups on either day 5 or day 10. These results suggest that the plasma fatty acid composition is directly affected by the composition of ingested lipid within a short period of time. However, the fatty acid composition of the erythrocyte membrane appears to be affected more by low LA intake than by lipid composition during a short period of ingestion.

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