Exercise molecule L-BAIBA strengthens muscle and counters diabetes-related weakness

Scientists at the University of Leeds have identified a molecule released during exercise that is required for muscles to adapt, strengthen and improve endurance. The study, published in Nature Communications, shows that L-β-aminoisobutyric acid (L-BAIBA) acts as a central regulator of muscle remodelling in response to training.

Led by Professor Lee Roberts, the research team found that L-BAIBA triggers beneficial changes in muscle structure and metabolism, linking the exercise signal to improved contractile function and fatigue resistance. Earlier work from 2014 had shown L-BAIBA enhances fat burning, but the new study establishes its direct role in muscle adaptation.

In mouse models of type 2 diabetes, L-BAIBA protected muscle from damage and weakness associated with the condition. The molecule operates through a PGC1α-BAIBA-PPARδ signalling axis, which the researchers say highlights a promising target for future therapies aimed at preserving muscle function in chronic disease.

Type 2 diabetes often leads to loss of muscle mass, strength and impaired metabolism, which can limit quality of life and make exercise difficult. Anna Morris of Diabetes UK noted that muscle weakness and fatigue are major barriers to staying active for many people with the condition.

The findings are at an early, preclinical stage and have been demonstrated in animal models. The study does not yet establish whether supplementing L-BAIBA in humans would replicate the protective effects seen in mice, and the molecule is already sold as a nutritional supplement without clinical validation for this use.

Roberts said the research provides new insight into how exercise benefits the body and could help shape future approaches to support people with type 2 diabetes in remaining active. Further studies will be needed to determine safety, dosing and efficacy in human populations.