GLP-1 Users Drop 560 Daily Steps and 6 MVPA Minutes Post-Initiation in Fitbit Cohort

The pre-post observational analysis drew from an electronic health record-linked research program and required valid Fitbit wear time both before and after GLP-1 initiation. Comorbidities included type 2 diabetes, hypertension, and musculoskeletal pain; 78.6 percent were female with mean age 52.7. No increase in activity accompanied weight loss, contradicting the common assumption that reduced body mass spontaneously raises movement. Largest reductions occurred in males and participants with joint or muscle pain, groups already at elevated risk for sarcopenia during caloric deficit. Side effects such as fatigue likely compound behavioral inertia, while the absence of randomized activity prompts leaves open whether structured exercise interventions can offset these trends.