Can I stop tirzepatide if I have already lost a lot of weight?

This study shows that most people regain significant weight within a year of stopping tirzepatide, and with that regain comes worsening blood pressure, blood sugar, and cholesterol. Always speak with your doctor before stopping any medication — they can help you create a safe plan.

Does tirzepatide need to be taken forever?

This research suggests that for many people, ongoing treatment is important to maintain weight loss and the health benefits that come with it. Like other chronic conditions such as high blood pressure, obesity may require long-term management. Discuss your personal options with your healthcare provider.

What is tirzepatide and what is it used for?

Tirzepatide (brand names Zepbound for obesity and Mounjaro for type 2 diabetes) is a once-weekly injectable medication that helps lower blood sugar and body weight. It works by mimicking two gut hormones that regulate appetite and insulin release.

Stopping Tirzepatide Reverses Cardiometabolic Gains

Key takeaways

✓People who kept off most weight (under 25% regain) maintained nearly all their improved waist size, cholesterol, and insulin levels
✓The study clearly maps how much heart and metabolic health worsens based on how much weight is regained — giving patients a useful benchmark
✓Findings reinforce that continued obesity treatment preserves real, measurable health benefits beyond just the number on the scale

Quick specs

Journal	JAMA internal medicine
Year	2026
PMID	41284285

What This Study Found

This research looked at what happens to people's health when they stop taking tirzepatide (Zepbound/Mounjaro), a medication used for obesity and diabetes. The study followed 308 adults who had already lost significant weight on tirzepatide for 36 weeks, then stopped the medication.

The Key Problem: Weight Comes Back

After stopping tirzepatide, most people regained weight within one year. Researchers divided participants into four groups based on how much of their lost weight they regained:

Less than 25% regained – kept most of their weight loss (best outcome)
25% to 50% regained – moderate weight regain
50% to 75% regained – significant weight regain
75% or more regained – regained nearly all lost weight (worst outcome)

What Happened to Heart and Metabolic Health

The more weight people regained, the more their cardiometabolic health worsened. Here is what changed after stopping tirzepatide:

Waist Circumference

Less than 25% regain: increased by only 0.8 cm (barely any change)
75%+ regain: increased by 14.7 cm — a significant rise

Blood Pressure (Systolic)

Even those who kept most weight off saw blood pressure rise by about 7 points
Those who regained the most saw a 10-point rise

Blood Sugar (HbA1c)

People who kept weight off: small rise of 0.14%
People who regained most weight: larger rise of 0.35%

Cholesterol and Insulin

Those who regained 75%+ of weight saw cholesterol worsen by nearly 11% and fasting insulin rise by 26%
Those who kept weight off showed little to no meaningful change in these measures

The Silver Lining

People who managed to keep their weight loss (less than 25% regain) largely maintained their improved waist size, cholesterol, and insulin levels. This shows that the health benefits of tirzepatide can be preserved — but only if weight loss is maintained.

What This Means for You

This study sends a clear message: obesity is a long-term condition that often requires ongoing treatment. Stopping medication without a plan to maintain weight loss can undo hard-won health improvements relatively quickly. Talk to your doctor before making any changes to your medication.

References & Sources

Frequently asked questions

Your HbA1c (a measure of average blood sugar) is likely to rise after stopping tirzepatide, especially if you regain weight. People who regained 75% or more of their lost weight saw HbA1c increase by 0.35%, while those who kept most weight off saw only a 0.14% rise.

Editorial note

This article is for educational purposes only and does not constitute medical advice. Always consult your healthcare provider before making changes to your diabetes management. Last reviewed: July 16, 2026 by the MDS Diabetes editorial team.

What to do next

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Stopping Tirzepatide Reverses Heart Health Gains