Prebiotics as Gut Microbiome Modulators: Definitions, Mechanisms, and Emerging Applications

Prebiotics are non-digestible food components that selectively stimulate the growth and activity of beneficial microorganisms in the gastrointestinal tract, significantly contributing to host health. This chapter provides a comprehensive examination of prebiotics, encompassing their definition, classification, and dietary sources, as well as their biochemical mechanisms of action and associated health benefits. It delves into various types of prebiotics, such as fructans, galactooligosaccharides, resistant starches, and human milk oligosaccharides, emphasizing their unique characteristics and sources. The discussion elucidates the role of prebiotics in modulating gut barrier integrity, influencing immune system function, and enhancing digestive health outcomes. Furthermore, the chapter highlights the applications of synbiotics—combinations of prebiotics and probiotics—in animal health, emphasizing their potential to reduce antibiotic dependence and enhance productivity. The chapter concludes by outlining future research trajectories and challenges in optimizing the therapeutic utility of prebiotics for maintaining a balanced and resilient gut microbiome, advocating for further research and large-scale trials to unlock their full potential in both human and animal nutrition.