Microalgae and the gut microbiome: Insights from animal models to human trials

Abstract

ABSTRACT: The gut microbiota is a vast consortium of microorganisms living in the gastrointestinal tract that plays essential roles in host metabolic, nutritional, and immune functions. However, this delicate ecosystem is susceptible to disruptions, or dysbiosis, which have been associated with conditions such as inflammatory bowel disease, obesity, and metabolic syndrome. The consumption of Western diets disrupts gut function; however, functional foods are essential for healthy microbiota. Microalgae, known for their ecological sustainability and rich nutritional profile, are increasingly considered promising sources of bioactive compounds, with growing evidence suggesting they may support the growth of beneficial gut microbes and help restore microbial balance. Microalgal-rich diets have shown promise by modulating fatty acid metabolism, inhibiting gut inflammation, and improving gut health. Despite previous investigations, the specific effects of microalgae on the gut microbiome remain underexplored, and the available data are dispersed. This review aims to unite and apprise the current scientific literature on the effects of microalgae-based dietary interventions on the gut microbiome by examining studies conducted in animal models, evidence from human-based approaches, including in vitro gut models and clinical trials, and identifying critical knowledge gaps in this research area. By highlighting the most relevant findings and outlining areas requiring further investigation, this review underscores the emerging potential of microalgae as microbiome-modulating agents and their promising role in next-generation functional foods for human health.

Keywords: microalgae, gut microbiome, animal models, clinical trials, prebiotics