Your body can potentially use stored fat for energy while simultaneously using dietary protein and amino acids for muscle protein synthesis
Liu, Y., Hazlewood, G
Significant fat loss usually begins once you reach a stabilised, higher therapeutic maintenance dose
A multidisciplinary advisory from major nutrition, lifestyle medicine, obesity medicine, and obesity research organizations recommends screening dietary intake, medical conditions, strength, function, physical activity, and other lifestyle factors when initiating GLP-1 therapy
That combination is why early retatrutide data looked almost implausibly good
What emerges is a coherent biological framework: estrogen maintains the mitochondrial infrastructure and synaptic stability that neurons depend on for sustained function, while GLP-1 receptor activation reduces the inflammatory burden that progressively degrades that infrastructure