GLP-1 Demand Shock: Work Reallocation, Productivity Decline, and Training Implications Across General and Bariatric Surgery.

Abstract

In the glucagon-like peptide-1 receptor agonists (GLP-1RAs) era, demand for bariatric surgery has decreased. How surgical systems absorb such demand shocks, through reassignment of operative work and effects on productivity, remains poorly characterized. To quantify changes in bariatric surgery volume, redistribution of operative work, and bariatric surgeon productivity during rapid diffusion of GLP-1RAs within a large integrated health system. We analyzed enterprise operative records from 31 hospitals (2021 Q3-2025 Q4) for changes in volume and productivity between bariatric and non-bariatric surgeons using difference-in-differences mixed-effects count models to estimate differential changes in procedure volumes for bariatric versus non-bariatric surgeons (DID-IRR). Among 209,169 operative encounters, 9,849 were bariatric procedures. Quarterly bariatric volume declined from 693 cases in 2021 Q3 to 354 in 2025 Q4 (-48.9%), and the bariatric share of total volume fell from 6.29% to 2.99%, despite stable overall system operative volume and surgeon staffing. Despite this contraction, bariatric surgeons maintained their overall operative activity by increasing volume in a composite of competitive procedures relative to non-bariatric surgeons (DID-IRR 1.31; 95% CI 1.12-1.53), and particularly for increased hernia operations (DID-IRR 1.41; 95% CI 1.14-1.74). Quarterly mean wRVU units per bariatric surgeon declined 27% from peak to trough. Conclusions: Bariatric surgery volume contracted sharply within a stable workforce, yet bariatric surgeons remained clinically active through measurable redistribution into other general surgery without incremental growth. This substitution preserved operative participation while compressing productivity, highlighting operational, financial, and training implications in the GLP-1RA era.