Abstract
ABSTRACT Phenolic compounds show promise in treating obesity and enhancing intestinal health. This systematic review addressed the following question: “What are the effects of polyphenols on intestinal health in preclinical studies with diet-induced obesity?”. The review followed PRISMA guidelines and was registered in PROSPERO(CRD42021262445). Studies published until April 2024 were selected from Medline(PubMed), Web of Science, Scopus, Embase, and ScienceDirect using terms related to polyphenols, obesity, and microbiota in rats and mice. Thirty papers meeting PICOS criteria were included. Bias risk was assessed with the SYRCLE tool, yielding scores between 4.5 and 7.0 out of 10. Findings indicated that 22 phenolic compounds improved gut microbiota diversity, reduced the Firmicutes/Bacteroides ratio, and modulated microbiota at various taxonomic levels. They also increased short-chain fatty acids, tight-junction expression, enhanced intestinal morphology, and reduced endotoxemia and inflammatory cytokines. These results suggest phenolic compounds may help treat obesity by modifying the microbiota and improving intestinal health. However, further research is needed to standardize data and facilitate meta-analyses.
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