Excess nutrition in the first days of life altered gut microbes and mitochondrial function in mice, linking early development to muscle loss and metabolic decline in old age.
A mouse study in Nature Communications suggests that excess feeding in the first days of life may leave a biological imprint that reaches into old age, weakening muscles and worsening metabolic health later on. The researchers found that neonatal overfeeding accelerated age-related sarcopenia, the gradual loss of muscle mass and strength, in both male and female mice. They traced that long-term effect to changes in the gut lining and its microbial residents, particularly a mucus-dwelling bacterium linked to metabolic health. According to the paper, the work points to a developmental origin for muscle ageing rather than a problem that begins only in later life.
The study used a neonatal overfeeding model in mice and found that animals exposed to excess nutrition early in life lived for less time and developed more pronounced late-life muscle wasting and glucose-handling problems than normally fed controls. The authors report that the early dietary insult disrupted goblet cells, the specialised cells that help produce the intestine’s protective mucus layer, leaving a lasting defect in the gut barrier. That barrier appears to be important because it helps determine which microbes can colonise the intestine and how the host and microbiome communicate over time.
Akkermansia muciniphila emerged as a central player. Nature Communications reports that the altered mucus environment reduced colonisation by this bacterium as the mice aged. When the researchers transferred gut microbes from overfed, sarcopenic mice into healthy recipients, the recipients developed features of the same muscle-wasting phenotype, supporting the idea that the microbiota helped carry the effect forward. The study also links the microbiome shift to reduced production of acetate, a short-chain fatty acid, and to weaker signalling through GPR43, a receptor involved in metabolic regulation.
The muscle consequences were tied to mitochondria, the structures that generate energy inside cells. The researchers found that reduced acetate availability and suppressed GPR43 signalling were associated with impaired mitochondrial function in ageing muscle, which in turn aggravated sarcopenia. In a key rescue experiment, restoring A. muciniphila or giving acetate improved mitochondrial homeostasis and boosted physical performance in aged mice. That finding strengthens the study’s argument that the gut-muscle pathway was not merely associated with decline but was part of the mechanism driving it.
The broader message is that early-life nutrition may shape ageing biology far beyond body weight alone. Reviews in recent years have described A. muciniphila as a microorganism of growing interest in healthy ageing, with links to intestinal barrier function, metabolic health and musculoskeletal decline. Even so, the new findings are still preclinical, and the mouse model does not map neatly on to human infant feeding. Human infancy unfolds differently, with different nutrition, growth patterns and environmental exposures, so any suggestion that the same pathway operates in people will need long-term cohort studies and cautious interpretation.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
