Dietary polyphenols regulate appetite mechanism via gut-brain axis and gut homeostasis

Dietary polyphenols promote the production of intermediary metabolites by the gut microbiota that regulate appetite, obesity and gut homeostasis in the host. [Display omitted] •Dietary polyphenols stimulate satiety hormone release by promoting gut microbial metabolites.•Satiety signaling can be involved in appetite regulation via the gut-brain axis.•Polyphenols can regulate the energy metabolism via appetite related pathways.•Dietary polyphenols exert prebiotic effects and maintain gut homeostasis. Nowadays, due to the rise of fast-food consumption, the metabolic diseases are increasing as a result of high-sugar and high-fat diets. Therefore, there is an urgent need for natural, healthy and side-effect-free diets in daily life. Whole grain supplementation can enhance satiety and regulate energy metabolism, effects that have been attributed to polyphenol content. Dietary polyphenols interact with gut microbiota to produce intermediate metabolites that can regulate appetite while also enhancing prebiotic effects. This review considers how interactions between gut metabolites and dietary polyphenols might regulate appetite by acting on the gut-brain axis. In addition, further advances in the study of dietary polyphenols and gut microbial metabolites on energy metabolism and gut homeostasis are summarized. This review contributes to a better understanding of how dietary polyphenols regulate appetite via the gut-brain axis, thereby providing nutritional references for citizens' dietary preferences.