How much weight can you lose with a gastric balloon? This is one of the most frequently asked questions — and while the accurate answer is "it varies from person to person," we have strong data from 4 separate clinical studies. In this article we present the figures along with their sources and set expectations against reality.
Clinical Measurement Standard: TBWL and EWL
Two fundamental measurements are used in weight loss studies:
- TBWL (Total Body Weight Loss): Percentage loss relative to starting weight — the standard and preferred metric in the obesity literature for cross-study comparison. Because it is independent of body-type variation, it has been adopted as the reporting standard in bariatric and endoscopic intervention studies.
- EWL (Excess Weight Loss): Loss expressed as a percentage of "excess weight" — it varies by body type, which makes comparison difficult
Allurion studies predominantly report using TBWL.
Study 1: 1,770 Patients — Ienca et al. 2020
This is the most comprehensive Allurion retrospective study published to date.
Details:
- N: 1,770 consecutive patients, 19 centers
- Duration: 16-week program
- Publication: Obesity Surgery 2020;30(9):3354-3362
- PMID: 32279182 →
Result:
- Mean TBWL: 14.9%
- For someone starting at 70 kg, an average loss of ~10.4 kg
- Serious adverse event rate: <0.2%
Individual results may vary. The group average does not represent the individual.
Study 2: One Year Later — Caballero et al. 2025
This is a comprehensive study measuring weight management after the balloon is excreted.
Details:
- N: 522 patients, international multicenter
- Follow-up period: 12 months after the balloon was excreted
- Publication: Obesity Surgery 2025
- PMID: 40676353 →
Result:
- In the Caballero et al. (2025) multicenter cohort, the vast majority of patients were able to maintain a significant portion of the weight loss they achieved 12 months after the balloon was excreted (PMID: 40676353).
- This finding is consistent with the literature linking the durability of weight loss to the program's behavioral change infrastructure; it nuances, with clinical data, the common perception that "all the weight loss is regained once the balloon is gone."
The key behind this result: the Allurion Program's behavioral change infrastructure — the app, smart scale, and remote physician follow-up.
Study 3: The Digital Tracking Difference — Dejeu et al. 2024
Details:
- N: 571 patients
- Focus: The effect of Allurion smart scale + app use on outcomes
- Publication: Clin Pract 2024;14(3):765-778
- PMID: 38804393 →
Result:
- Patients who regularly used the digital tracking tools showed higher adherence and better results
- The frequency of scale and app use showed a positive correlation with weight loss
This is the answer to the question "Why is Allurion not just a balloon?"
Study 4: Real World — Multicenter 2025
Details:
- Registry: Obesity Surgery 2025
- PMID: 41037243 →
- Reflects real-world practice rather than a clinical research setting
This multicenter real-world registry provides evidence that the weight loss outcomes observed in a controlled study setting are largely reproducible in routine clinical practice as well (PMID: 41037243).
Türkiye Data
Within the global data, the averages of clinics in Türkiye stand out:
- Published multicenter mean TBWL: ~15% (14.9%) (Ienca 2020, n=1,770; PMID 32279182)
Consistent with the published multicenter data, similar results within the same range are observed in clinics in Türkiye as well (Data on File, Allurion 2026). This is not a claim of superiority; it should be regarded as an indicator of consistent performance. Individual results may vary.
Factors That Affect Outcomes
Clinical studies show the group average. Individual outcomes vary depending on the following factors:
| Factor | Effect |
|---|---|
| Starting BMI | Absolute loss may be greater at a higher BMI |
| Program adherence | App + scale use is protective |
| Dietary change | Not the balloon alone, but a foundation of habits |
| Physical activity | Preserving muscle mass is important |
| Physician follow-up | Frequent monitoring yields better results |
What Should a Realistic Expectation Be?
The accurate answer to the question "How much weight will I lose?" differs according to your starting weight, your adherence to the program, and your metabolic status. Although clinical data show a group average of 14.9% TBWL:
- Some patients achieve results above this average
- Some patients experience less loss
- Clinical follow-up data support a higher likelihood that weight loss is maintained over the long term in patients who complete the program and sustain behavioral change (PMID: 40676353).
We recommend that you discuss your personal goals and realistic expectations during your physician consultation.
Combining the Gastric Balloon With GLP-1
Preliminary results regarding combination protocols of the gastric balloon — applied based on physician evaluation — with low-dose GLP-1/GIP receptor agonists point to a trend toward higher TBWL compared with the balloon alone; published studies examining the combination of the balloon with GLP-1 support this direction (PMID: 41212463). The approximately 23% TBWL value reported in the Allurion-Eli Lilly preliminary analysis of February 2026 (n=76; at the press-release level, with peer review ongoing) is still a preliminary finding and should not be interpreted as a definitive result.
The decision to combine should be made together with your specialist physician.
More information: GLP-1 + Gastric Balloon Combination Therapy →
Continue reading:
- Swallowable Gastric Balloon 2026 Comprehensive Guide →
- What Happens When You Stop GLP-1? →
- Clinical Evidence →
- Calculate BMI →
- Find a Specialist →
This content is for general informational purposes. Consult your specialist physician for a personalized weight loss estimate.
An Authorized Clinic in a City Near You
You can undergo the Allurion Program at more than 60 authorized clinics across Türkiye. For clinics in major cities:
Clinical Sources
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