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Study breakdown

Weight Regain After Stopping Tirzepatide Proportionally Reverses Metabolic Improvements

RPEP-153072026Horn, Deborah B; Linetzky, Bruno; Davies, Melanie J; Laffin, Luke J; Wang, Hui; Murphy, Madhumita A; Zimner-Rapuch, Sarah; Lau, Eva; Arad, Avigdor D; Lee, Clare J
evidence
The takeaway

After tirzepatide withdrawal, 75%+ weight regain occurred in most patients within 1 year, with cardiometabolic improvements (waist, BP, HbA1c, insulin) reversing proportionally to weight regain degree.

Proportional reversal

Metabolic improvements from tirzepatide reversed in direct proportion to weight regain after stopping: <25% regain preserved gains, ≥75% regain erased them

What the researchers found

After tirzepatide withdrawal, weight regain ≥75% in most patients within 1 year. Cardiometabolic reversal proportional to regain: waist (+0.8 to +14.7 cm), SBP (+6.8 to +10.4 mmHg), HbA1c (+0.14 to +0.35%), fasting insulin (-4% to +46%) across <25% to ≥75% regain categories.

Why it matters

This provides the most detailed look at what happens after stopping tirzepatide — showing that metabolic benefits are proportionally lost with weight regain.

How the study worked

Post-hoc analysis of SURMOUNT-4 RCT (NCT04660643), 308 tirzepatide-treated participants (≥10% weight loss at wk 36) randomized to placebo, categorized by weight regain degree at wk 88.

What this study cannot tell us

Post-hoc analysis. 52-week withdrawal period. Selection bias possible in regain categories.

How to read the evidence

Post-hoc analysis of landmark RCT. Well-powered with clear dose-response relationship between regain and metabolic reversal.

When this study was published

Published in 2025 from SURMOUNT-4 data.

The bigger picture

This definitively shows GLP-1/GIP drugs treat obesity but don't cure it — withdrawal leads to proportional reversal, like stopping blood pressure medication.

Questions still open

  • What determines which patients regain less weight?
  • Could intermittent dosing maintain some benefits?
  • Should tirzepatide be considered lifelong therapy for all patients?

Common questions

What happens when you stop tirzepatide?
Most patients regain at least 25% of lost weight within a year, and their metabolic improvements reverse proportionally. Those who regain the most weight lose nearly all the metabolic benefits.
Does this mean I need to take it forever?
Current evidence suggests yes — like blood pressure medication, stopping tirzepatide leads to return of the underlying condition. Patients who maintained the most weight loss had the best metabolic outcomes.

Read the original research

Cardiometabolic Parameter Change by Weight Regain on Tirzepatide Withdrawal in Adults With Obesity: A Post Hoc Analysis of the SURMOUNT-4 Trial.

JAMA internal medicine, 186(2), 157-167

View on PubMed ↗Publisher’s paper ↗

Citation

Horn, Deborah B; Linetzky, Bruno; Davies, Melanie J; Laffin, Luke J; Wang, Hui; Murphy, Madhumita A; Zimner-Rapuch, Sarah; Lau, Eva; Arad, Avigdor D; Lee, Clare J. (2026). Cardiometabolic Parameter Change by Weight Regain on Tirzepatide Withdrawal in Adults With Obesity: A Post Hoc Analysis of the SURMOUNT-4 Trial.. JAMA internal medicine, 186(2), 157-167. https://doi.org/10.1001/jamainternmed.2025.6112