Understanding whether your weight loss is on track
Seeing your weight increase after surgery can make you wonder whether the operation has failed. But weight regain alone doesn’t tell the whole story about whether a bariatric procedure was successful.
How much weight you initially lost, when it returned and how your health has changed all matter.
A 2025 paper published in Obesity Surgery proposes definitions for partial response, nonresponse and clinically significant weight regain after bariatric surgery.
These proposed benchmarks may help identify whether additional support is needed when considering a complex revision surgery.
| Weight-loss response | Proposed definition | Example |
| Partial response | Losing 10–20% of your starting body weight. | Starting at 120 kg and losing 12–24 kg. |
| Nonresponse | Losing less than 10% of your starting body weight. | Starting at 120 kg and losing less than 12 kg. |
| Clinically significant weight regain | Regaining more than 20% of the weight you initially lost. | Losing 30 kg, then regaining more than 6 kg. |
‘Weight loss is measured using your lowest weight after surgery, and weight regain refers to the proportion of the weight you lost that has returned,’ says Dr Winnett. ‘Many patients feel disappointed if weight returns.’
A study of 145,000 patients in the Annals of Surgery found that about 4% had revisional surgery within 10 years of their first bariatric procedure.
‘But weight regain doesn’t have to mean the end of your story,’ Dr Winnett says. ‘View it more as a chapter that asks for support, not shame. You’ve already shown the courage to seek change once, and that same courage can guide the next step, which is different for every patient.’
The reasons for weight regain or less weight loss than expected can be complex and may include:
- Changes in appetite and hunger signals
- Stress, low mood or changes in eating habits
- Reduced physical activity or gaps in ongoing support
- Changes to the stomach pouch or its outlet after surgery
Do I need another operation?
Once the reasons for your weight changes are clearer, the next question is what might help.
‘Another operation is one option, but it isn’t always necessary,’ says Dr Winnett. ‘The next step depends on your original procedure, your current health and what we find during assessment.’
Some people may benefit from additional support or medication alone, while others need further investigation before we can discuss another procedure.
Non-surgical treatment and support
Even years after surgery, reconnecting with your treating team can help.
A dietitian can assess your nutritional intake and help with meal patterns, while a psychologist can support you with emotional eating, stress or concerns about food.
Weight-loss medication may also be considered.
The authors of the previously mentioned 2025 paper in Obesity Surgery describe medication as a possible additional treatment when anatomical problems have been excluded.
The choice depends on your medical history, suitability and response, with ongoing appointments to monitor progress and side effects.
‘Needing more support doesn’t undo the progress you’ve already made,’ says Dr Winnett. ‘Your treatment may need to change as your needs change.’
Endoscopic procedures and revisional surgery
If medication and ongoing support haven’t helped enough, or tests reveal a structural problem after your first surgery, your treating team may discuss a further procedure.
‘Before considering another procedure, we need to understand what it could improve for you,’ says Dr Winnett. ‘Your original surgery, symptoms and overall health all help guide that decision.’
There are two main approaches:
- Endoscopic revision: A doctor works through a flexible tube passed through your mouth, without abdominal cuts. For some patients with weight regain after gastric bypass, a procedure called TORe uses internal stitches to narrow an enlarged opening between the stomach pouch and small intestine.
- Revisional surgery: A surgeon operates again to repair or change your original procedure. This may be appropriate when a problem cannot be treated endoscopically, or when converting to another type of weight-loss surgery could help.
For selected patients, endoscopy may offer a less invasive option.
A study published in Gastrointestinal Endoscopy found fewer complications after endoscopic treatment than surgical revision of an enlarged outlet following Roux-en-Y gastric bypass. Weight loss did not differ significantly between groups at five years.
Both approaches carry risks and require ongoing care.
An assessment with your surgeon and treating team can help determine whether you need a referral to another service.
Ask about the potential benefits, risks, recovery and follow-up care before deciding.
Getting advice on your next steps in Melbourne
If you’re concerned about weight regain or your progress after surgery, speaking with Dr Winnett can help you understand what may be happening and whether further treatment is appropriate.
You don’t need to decide on another procedure before asking for advice. Contact Winnett Specialist Group to talk through your options.
References
- Proposed Definitions and Clinical Recommendations for the Management of Weight Recurrence, Partial Response, and Nonresponse Following Metabolic and Bariatric Surgery. Obesity Surgery. 2025.
- Incidence and Indications for Revisional Metabolic Bariatric Surgery: A 10-Year Analysis from the Australian and New Zealand Registry Annals of Surgery, 2026.
- Endoscopic versus surgical gastrojejunal revision for weight regain in Roux-en-Y gastric bypass patients: 5-year safety and efficacy comparison. Gastrointestinal Endoscopy. 2021.
Contact
P (03) 9417 1555
admin@winnettspecialistgroup.com.au
www.winnettspecialistgroup.com.au
Queens Terrace, 382 Victoria Parade, East Melbourne 3002
This page was reviewed by Dr Jason Winnett and dietitian Ashleigh Gale, July 2026, AHPRA No: MED0001155541
General information only. Not medical advice. All procedures carry risks and results are individual. Consult your GP and a qualified surgeon or seek a second opinion before proceeding.
