Mixed
Gut microbiota acts as a mediator between nutrition and skeletal muscle function (the 'gut-muscle axis'), where bacterial metabolites such as short-chain fatty acids (SCFAs) and urolithins influence muscle anabolism, mitochondrial biogenesis, and inflammation.
To support muscle health, especially as you age, prioritize a diet rich in diverse fibers (vegetables, fruits, whole grains) and fermented foods. This feeds gut bacteria that produce metabolites (like butyrate) which reduce muscle inflammation and improve energy efficiency. While exercise and protein are primary, a healthy gut ensures your body can actually use them effectively.
The bacterial metabolism of nutrients theoretically influences skeletal muscle cell functionality through producing mediators that drive all of these systemic effects... we conclude that the literature supports the possible presence of a 'gut–muscle axis', whereby gut microbiota may act as the mediator of the effects of nutrition on muscle cells.
Why this rating
The paper is a review of observational, animal, and limited human mechanistic studies; no large-scale randomized controlled trials (RCTs) proving causality in sarcopenic humans are cited.
Source
Aging Gut Microbiota at the Cross-Road between Nutrition, Physical Frailty, and Sarcopenia: Is There a Gut–Muscle Axis?
Andrea Ticinesi et al. · Nutrients · 2017
DOI 10.3390/nu9121303
More from this paper
- Short-chain fatty acids (SCFAs), particularly butyrate, produced by gut bacteria (e.g., Faecalibacterium, Butyricimonas) promote skeletal muscle mitochondrial biogenesis, insulin sensitivity, and prevent muscle protein catabolism.Moderate
- Exercise increases gut microbiota biodiversity and the abundance of health-promoting taxa (e.g., Akkermansia, Faecalibacterium), which correlates with better physical performance and muscle function.Moderate
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