Staying strong on a GLP-1 starts with the right question, which is not “how much did the scale move.” Rapid weight change can include lean tissue along with fat, so what matters is the set of markers and inputs a physician watches to support lean mass over time. The two biggest levers, adequate protein and resistance training, sit outside any prescription, and the labs add the context to read them against. Here is what to watch and why the panel comes first.
Why lean tissue is part of the picture (lean mass on glp-1)
Any sustained, rapid change in body composition can draw on lean tissue, not just fat, and that is true of weight change generally, not unique to one medication. This is why a physician frames GLP-1 care through markers rather than a single bodyweight figure. A scale cannot tell fat from muscle from water; markers and inputs get closer, and they are what a clinician actually reviews. The goal of watching lean mass on glp-1 care is context: understanding what is changing, so protein, training, and monitoring can be adjusted under physician supervision rather than left to chance. None of this is a promise about results; it is a description of what gets measured.
The two inputs that do the heavy lifting (protein and resistance training)
The strongest, best-supported levers for holding lean mass are not exotic. They are adequate protein intake and resistance training, and both matter more during a period of weight change, not less. Protein supplies the raw material the body uses to maintain muscle; resistance training supplies the signal that tells the body to keep it. On a GLP-1, appetite often falls, which can make hitting a protein target harder, so it is worth tracking deliberately rather than assuming. These inputs sit alongside the medication, not inside it, and a physician can factor your habits into how care is monitored. For men, hormone context belongs here too: free testosterone relates to lean mass, which is why it is read as part of the wider panel rather than in isolation. (See what your testosterone numbers mean.)
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The labs a physician reads alongside (glp-1 baseline labs)
Inputs are read against data, and that data comes from the panel. The same metabolic markers that frame GLP-1 weight care, HbA1c, fasting glucose and fasting insulin, a lipid view, and ALT, also give a physician the baseline to monitor over time. For men, free testosterone and SHBG add hormonal context relevant to lean mass. None of these markers is a verdict on its own. They are orientation: a starting picture and a set of values a physician can recheck to see how things are tracking. For the full marker-by-marker breakdown, see what a GLP-1 metabolic panel measures, and for how the medications themselves compare, see tirzepatide vs semaglutide.
Reading them together (labs before molecules)
Protein, training, and labs are not three separate checklists. They are read together, and they are most useful when there is a baseline to compare against. This is the “labs before molecules” idea: you measure first, across enough markers to see the real pattern, and you measure again during care so change is observed rather than assumed. A baseline panel plus a retest is what turns “staying strong on a GLP-1” from a hope into something a physician can actually monitor. The Telos Panel exists so the metabolic and hormonal context is read in full, not in fragments. (See the Telos Panel and what a full panel covers.)
What your physician does with this
At Telos, the information you provide and the panel you complete are reviewed by a licensed physician through the affiliated medical group. They read your metabolic and, where relevant, hormonal markers alongside your history and your inputs, and decide what, if anything, fits, including whether GLP-1 care is appropriate and how it should be monitored. If care is prescribed, it is overseen by a physician and rechecked with labs over time. The physician may or may not establish a treatment relationship. Telos is a marketing and advertising company; it does not practice medicine, prescribe, or employ physicians. Nothing here is medical advice.
