A healthy diet and lifestyle lead to increased GLP-1 levels. Were there actually any studies on their effect on healthy and fit people? Loss of muscle mass is

A healthy diet and lifestyle lead to increased GLP-1 levels. Were there actually any studies on their effect on healthy and fit people? Loss of muscle mass is already recognized: https://pubmed.ncbi.nlm.nih.gov/38937282/ https://pubmed.ncbi.nlm.nih.gov/38937282/ And probably especially bad in people without fat reserves.