Is eating behavior manipulated by the gastrointestinal microbiota? Evolutionary pressures and potential mechanisms.
Level 5 - mechanism / opinion, no new human data
Narrative review and theoretical hypothesis paper based on mechanistic and evolutionary reasoning without new empirical human data.
PubMed 25103109 · doi:10.1002/bies.201400071
What was done
This narrative review synthesized evolutionary theory and literature on potential mechanisms through which gastrointestinal microbes may influence host dietary choices and eating behavior. The authors evaluated potential biological pathways including vagus nerve signaling, alteration of taste receptors, production of mood-altering toxins, and modulation of host reward and satiety pathways.
What was found
The abstract reports no quantitative data or numerical findings. It outlines a theoretical model proposing two strategies by which microbes alter host behavior to optimize their own fitness: inducing specific food cravings that favor microbial specialization or suppress competitors, and causing dysphoria until preferred nutrients are consumed.
Why it matters
It provides an evolutionary biology framework for understanding persistent unhealthy eating behaviors and suggests that manipulating the microbiome via diet, prebiotics, probiotics, antibiotics, or fecal transplants could offer novel strategies to treat obesity.
Limits
This is a theoretical narrative review rather than an empirical trial or systematic review, presenting no original human data or quantitative effect sizes. The proposed strategies and causal pathways remain speculative mechanistic hypotheses that require direct experimental validation.
Cited by
- context Studies show that gut microbiota composition sends signals that hijack the central nervous system to trigger cravings for specific foods.