FDA_TrackerJim said:lean mass + resistance training is the combo.
Thank you — that is the clearest version of this I have read, and I have read a lot of them.
Adding the clinical framing, because it changes how the question reads.
Muscle fiber type changes during GLP-1-mediated weight loss, relevant to lean mass: preliminary biopsy data suggests that weight loss shifts the skeletal muscle fiber type distribution:
This "metabolic remodeling" of muscle may contribute to improved insulin sensitivity independent of total lean mass changes. The muscle you keep becomes metabolically better, even if there's less of it[1].
Dr.AddMedPHL said:Muscle fiber type changes during GLP-1-mediated weight loss, relevant to lean mass: preliminary biopsy data suggests that weight loss shifts the…
Same experience, arrived at from the opposite direction.
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Shop Reference StandardsDr.AddMedPHL said:Muscle fiber type changes during GLP-1-mediated weight loss, relevant to lean mass: preliminary biopsy data suggests that weight loss shifts the…
Sharing my comprehensive lab data relevant to lean mass:
| Biomarker | Baseline | Month 3 | Month 6 | Month 9 |
|---|---|---|---|---|
| Weight (lbs) | 279 | 264 | 229 | 204 |
| A1C (%) | 6.9 | 6.9 | 6.0 | 5.6 |
| hsCRP (mg/L) | 9.0 | 4.0 | 2.5 | 1.5 |
| Triglycerides | 249 | 149 | 139 | 109 |
Protocol: Tirzepatide 15mg/wk, resistance training 4x/week, protein 1.6g/kg/day.
The improvements in lean mass are clearly reflected in these numbers. The inflammatory marker reduction (hsCRP) is particularly striking.
Dr.AddMedPHL said:Muscle fiber type changes during GLP-1-mediated weight loss, relevant to lean mass: preliminary biopsy data suggests that weight loss shifts the…
Physical therapist weighing in on lean mass. I work with bariatric and metabolic patients daily.
The resistance training evidence is critical here:
The Lundgren 2024 JAMA paper[1] showed that structured resistance training preserved 73% more lean mass in GLP-1 patients vs medication alone. When discussing lean mass, we MUST include the exercise component.
My minimum prescription: 3x/week compound movements (squat, deadlift, press, row), progressive overload, 7-10K steps/day, and 1.2-1.6g protein/kg/day.