A peer-reviewed mouse study links neonatal overfeeding to lasting intestinal-barrier changes and faster muscle loss in ageing animals. The experiments trace a connection through gut bacteria, acetate production and muscle energy function. Restoring a bacterium or supplying acetate improved some functions in aged mice. The findings describe one animal study and establish no treatment benefit in humans.
Early overfeeding left mice with more pronounced muscle loss and metabolic dysfunction as they aged. A single peer-reviewed experiment examined both sexes and followed muscle structure and performance across adulthood and old age. Muscle energy-producing structures also functioned less effectively in aged animals that had experienced early nutritional excess.[1]
Researchers altered nutrition during nursing, either by changing litter size or by feeding mothers a high-fat diet. Overfeeding disrupted the development of goblet cells, which produce the mucus protecting the intestinal surface. Lasting barrier defects accompanied reduced colonization by Akkermansia muciniphila, a gut bacterium. Transferring the microbial community to other mice transferred features of muscle loss, supporting its contribution to the observed process.[1]
Reduced bacterial colonization accompanied lower production of acetate, a short-chain fatty acid investigated for its connection to muscle mitochondrial function. In aged mice, adding acetate or reintroducing the bacterium improved muscle performance and restored mitochondrial homeostasis. Nutrition, mucus-barrier development and microbial changes were examined as experimental steps in one animal study. Human treatment effects were not tested, and the experiments supply no personal dietary recommendation.[1]
