Abstract
Currently, most studies focus on the functions of probiotic-fermented milk, whereas there are relatively few studies on the function of postbiotic-fermented milk in relieving constipation. In this study, we aimed to assess the modulation of constipation symptoms and its mechanism of action by different concentrations of Lacticaseibacillus paracasei-fermented milk as a postbiotic in a loperamide hydrochloride-induced constipation model in BALB/c mice. By comparing the relevant indexes, colon histological analysis, gene expression level, and intestinal flora structure in the constipation model of mice, we found that high and ultra-high doses of fermented milk can effectively relieve constipation. Fermented milk effectively reduced defecation time, increased the rate of small intestinal propulsion in constipated mice, and alleviated colonic inflammation, safeguarding the normal function of the intestinal tract. In addition, it can regulate the intestinal flora, downregulate the abundance of Proteobacteria, upregulate the abundance of species of Firmicutes and Actinobacteriota, and improve the overall abundance level of intestinal flora in mice.
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