The effect of Benitenshi sweet potatoes on defecation and gut microbiota was examined in 22 female university students. The study included 4 experimental periods and lasted 4 weeks. The first week was the control period; the students consumed 300 g, 0 g, and 100 g of Benitenshi during the 2nd, 3rd, and 4th weeks, respectively. Dietary fiber in peeled Benitenshi was estimated to be 2.9 g per 100 g after heat-treatment at 200-210℃ for 1 hour. Fecal weight was measured in comparison to a wood cube. Subjetive bowel condition and abdominal distention were assessed using 4-score questionnaires. For measurement of microbiota, fresh fecal samples were collected on the last day of each experimental period. Gut microbiota was analyzed by terminal restriction fragment length polymorphism (T-RFLP) . The results showed that fecal weight was 1.6 times higher after ingestion of 300 g of Benitenshi and 1.5 times higher after ingestion of 100 g, compared with the control period. Defecation frequency was also significantly increased after intakes of 300 g compared with intake during the control period. Bowel condition and ease of defecation were improved with an intake of 300 g, and abdominal distention did not change. In addition, increased Benitenshi intake significantly increased the levels of the operational taxonomic unit, A58, which contained Faecalibacterium sp. These findings suggest that Benitenshi intake might improve bowel condition and gut microbiota without abdominal distention.
"},{"@language":"ja","@value":"さつまいもの一種である紅天使を健康な女子大学生22人に摂取させた。加熱後皮をむいた紅天使の食物繊維は2.9 g/100 gだった。摂取開始前1週間を対照期とし, その後1週間単位で紅天使を1日300 g, 0 g, 100 gとそれぞれ摂取させた。排便のたびに手元にある直方体の木片 (37 cm3) と糞便を見比べ便量を目測した。その結果, 対照期には1.8±0.2 (個分/1日平均) だった排便量が, 300 gの紅天使摂取により約1.6倍に, 100 g摂取により約1.5倍に増加した。排便回数も紅天使摂取量の増加に伴い増加した。300 g摂取でお腹の調子は良くなり便が柔らかくなったと評価されたが, 膨満感に有意な変化はなかった。各期の最終日には便の一部を採取し, 腸内常在菌構成を16S rRNA遺伝子を用いたT-RFLP法により解析した結果, 紅天使摂取により酪酸産生菌として知られるFaecalibacterium属を含む分類単位の占有率が有意に増加した。
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