Gut Microbiota and Brain Health: Exploring the Role of Probiotics in Cognitive Enhancement and Neuroprotection

Abstract

The gut microbiota is a fundamental regulator of host bodily functions, extending beyond its digestive role to influence brain function through the microbiota-gut-brain axis. This system enables two-way communication between the brain and gut bacteria through neural, endocrine, immune, and metabolic pathways that link gastrointestinal microbial communities to brain health and cognitive functions. The medical field recognizes dysbiosis, which involves changes to gut microbiota composition, as a risk factor for various neurological and psychiatric disorders that include anxiety and depression, Alzheimer's disease, and cognitive decline. Probiotics are live microorganisms that provide health benefits when consumed in sufficient amounts and remain viable. Probiotic strains can boost neurotransmitter production and reduce neuroinflammation, while experts work to fortify the blood-brain barrier and enhance synaptic plasticity, which together lead to better cognition and neuroprotection. Probiotics operate through three main pathways: regulating HPA axis functions and SCFA production, and controlling immune system responses, which help people deal with stress and brain aging.