Our Mental Health Is Determined by an Intrinsic Interplay between the Central Nervous System, Enteric Nerves, and Gut Microbiota.
Level 5 - mechanism / opinion, no new human data
Narrative review describing biological mechanisms without systematic search methodology or original human data.
PubMed 38203207 · doi:10.3390/ijms25010038
What was done
This is a narrative review examining the communication pathways between the gut microbiome, the enteric nervous system (ENS), and the central nervous system (CNS). The authors synthesize literature on microbial metabolites (bile acids, short-chain fatty acids), neurotransmitters (glutamate, GABA, dopamine, norepinephrine, serotonin, histamine), vagus nerve signaling, and entero-endocrine and immune responses in relation to neuropsychiatric conditions.
What was found
The abstract reports no primary experimental data, effect sizes, or quantitative findings. It describes structural and physiological pathways, noting that the ENS comprises 100 to 500 million neurons communicating bidirectionally with the brain via vagal fibers, and outlines how microbiome alterations modulate neurotransmitter synthesis relevant to mood, cognitive behavior, autism, depression, and schizophrenia.
Why it matters
It provides a conceptual framework linking microbial metabolism and enteric neural signaling to brain function, highlighting targets for potential psychobiotic interventions.
Limits
As a non-systematic narrative review, it lacks formal study selection criteria, risk-of-bias assessment, and original empirical data. The abstract provides purely descriptive and mechanistic claims without reporting specific human trial outcomes or effect estimates.
Cited by
- supports There are 200 million neurons in the human gut that continuously feed information to the brain.