Bioscience and Microflora
Online ISSN : 1349-8355
Print ISSN : 1342-1441
ISSN-L : 1342-1441
Changes of Intestinal Flora of Young Japanese Females Resulting from Two-Week Common Diet and Livingin the Same Dormitory
Yuriko KIKUCHIXia ZHUJunko TAKATAXing Gang ZHUOKazuyuki OMAEShaw WATANABE
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2003 年 22 巻 4 号 p. 145-153

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This intestinal flora study was a part of the Akakura Study, which was carried out to determine the cadmium (Cd) absorption rate from ordinary diets in humans by comparing Cd content in the diet with that in the feces and urine. This report describes the composition and changes of intestinal bacterial flora among young Japanese females living together in the same dormitory and eating the same Cd-controlled diets. Subjects consumed the same menus designed by a dietician for two weeks. Before and after the study, subjects completed a profile of mood states (POMS) questionnaire to ascertain stress levels. Fecal samples were collected and the flora analyzed at three points during the study. The mean wet and dry weights of feces per day were 98.6 g (74.2-136.7) and 21.0 g (16.3-25.4), respectively. The total number of bacteria did not change significantly during the study period. Bacteroidaceae, Eubacterium, Bifidobacterium, Enterobacteriaceae, Streptococcus and Lactobacillus were recovered from all subjects, while Bacillus and Peptococcaceae were obtained from about half of them. The major components were Bacteroidaceae, Eubacterium, and Bifidobacterium. The next common species were Enterobacteriaceae, Streptococcus, and Peptococcaceae, Lactobacillus, and Clostridium other than C. perfringens. C. perfringens, yeast and Megasphaera were present rarely or occasionally. As a stress level, mean POMS fatigue and depression scores were unchanged throughout the study, the vigor score increased and the tension-anxiety score decreased compared to those before starting the study. There were no significant differences in the composition of fecal flora among individual subjects. The total number of bacteria tended to decrease over time, but the change was not statistically significant. The proportions of Bifidobacterium and Bacteroidaceae tended to increase. Lactobacillus also tended to decrease in all participants, and it was not related to the removal of milk and yogurt from the diet. It is not clear what part of the diet caused these differences.

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