Quick notelean mass, muscle, function, etc are a concern with all routes to weight loss not just GLP-1 Lean mass is not the same as skeletal muscle When a DXA scan, bioelectrical impedance scale, or clinical trial reports lean mass, it is not measuring skeletal muscle alone
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These treatments work by: Stimulating insulin release from the pancreas Reducing glucagon secretion (which lowers glucose production in the liver) Slowing gastric emptying, so you feel full longer Acting on brain centers that control your appetite and cravings These effects help reduce appetite and improve blood sugar control, making managing weight safely and effectively easier
The concern is that improved ovulation in previously anovulatory women increases fertility, and rapid weight loss may affect oral contraceptive absorption if you're having GI side effects
Karen Hacker, with the Centers for Disease Control and Prevention, in a statement
Blogs Retatrutide vs Tirzepatide vs Semaglutide: Mechanism and Research Comparison By Clark Jones, PhD, Velora Research Written and reviewed for scientific accuracy by Clark Jones, PhD ([ORCID 0009-0005-9356-0297]( Last reviewed 2026-05-28