Is there clinical data showing how much weight loss to expect on average with a gastric balloon?

Yes. In a multicenter prospective study of the Allurion Balloon conducted across 22 centers in 14 countries (n=1,770), a mean TBWL (Total Body Weight Loss percentage) of 14.9% was measured. For an 80 kg person, this corresponds to roughly 11.9 kg of weight loss. Individual results may vary.

According to the studies, how many patients are known to have successfully completed the gastric balloon program?

The completion rate for the Allurion Program has been reported at 95% (n=1,770, Ienca et al. 2020). This rate reflects the program's suitability and tolerability.

When did Allurion receive FDA approval, and under which classification?

The Allurion gastric balloon received FDA PMA Class III approval on February 23, 2026. This classification indicates that the device underwent a high level of scrutiny for safety and effectiveness.

How long does the gastric balloon procedure take, and how many weeks does the balloon stay in place?

The program includes a swallowable Smart Capsule, a smart scale, a mobile app, and 6 months of nutrition coaching. Placing the balloon takes about 15 minutes, and it is naturally excreted from the body at around week 16.

How often do serious side effects of the gastric balloon occur?

According to published studies, serious adverse events have been observed at a frequency of less than 0.2%. Early- and late-stage complications are systematically evaluated in multicenter studies.

What criteria are required for the gastric balloon to be appropriate?

The Allurion Program can be applied to patients aged 18 and over with a BMI of 27 kg/m² or higher. All candidates must undergo a detailed physician evaluation before starting the program.

Weight Loss with a Gastric Balloon: What Does the Clinical Data Say? (n=2454)

"Do people really lose weight with a gastric balloon?" is one of the most legitimate questions in the decision-making process. In this article, we answer based on published clinical studies — not internet comments.

The Core Metric: What Is TBWL?

Clinical studies usually express weight loss as TBWL (Total Body Weight Loss — percentage of total body weight lost). For a 100 kg patient, 13% TBWL = 13 kg of weight loss.

Large-Scale Analyses

Bastid et al. 2026 — n=2,454

In a multicenter comparative analysis published in 2026, different balloon systems were evaluated across 2,454 patients. Systems that do not require endoscopy were reported to show similar or superior effectiveness compared with conventional balloons.

Source: PMID: 41705686

Ienca et al. 2020 — n=1,770

In the multicenter prospective study of the Allurion Balloon (22 centers, 14 countries), mean TBWL was measured at 14.9%. 95% of patients completed the 16-week program.

Source: PMID: 32279182, Obesity Surgery

Caballero et al. 2025 — n=522

In a one-year follow-up study (n=522), continued weight loss was observed over the 12 months following balloon removal. The long-term program was noted to contribute to weight maintenance.

Source: PMID: 40676353

Multicenter Retrospective 2025 — n=~300

In a retrospective multicenter study published in 2025, early- and late-stage complication rates were evaluated together with effectiveness.

Source: PMID: 41037243

Summary Data Table

Study	n	TBWL	Duration
Bastid 2026	2,454	Comparative analysis	16 weeks
Ienca 2020	1,770	14.9%	16 weeks
Caballero 2025	522	1-year follow-up	12 months post-balloon
Multicenter 2025	~300	Effectiveness + safety	16 weeks

Factors That Affect Weight Loss

Clinical data provide an average. Individual results vary depending on the following factors:

Positive influences:

Adherence to the program (diet + exercise coaching)
Starting BMI (results are more predictable in the 27–35 range)
Active app tracking
Regular physician/dietitian follow-up

Limiting factors:

Maintaining irregular eating habits
Avoiding exercise
Underlying hormonal disorders (thyroid, etc. — should be screened before the balloon)

Risk of Weight Regain After the Balloon

If a healthy lifestyle is not maintained after the balloon is removed, weight regain can occur. For this reason, the 16-week balloon program is positioned as a starting point; building sustainable habits is the real goal.

It is worth recalling that an average regain of +5.63 kg has been reported after discontinuing GLP-1 receptor agonists (18 RCTs, n=3,771, PMID: 41399474). With the gastric balloon, this depends on the quality of the program.

Conclusion

Published data show that, with appropriate patient selection, the gastric balloon delivers clinically meaningful weight loss. A mean TBWL of 14.9% corresponds to ~11.9 kg of weight loss for an 80 kg patient.

For a detailed assessment, fill out the preliminary application form.

Find 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

Results & Effectiveness

Gastric Balloon Reviews: How to Evaluate Real Patient Experiences

How should you read gastric balloon reviews? Look at clinical data instead of internet comments. A 2026 guide to realistic expectations and program impact.

2026-03-197 min read

Results & Effectiveness

Weight Regain After a Gastric Balloon — What Is the Real Risk?

Is weight regained after the gastric balloon program ends? 1-year follow-up data from 522 patients, the factors that influence regain, and how to maintain lasting weight loss.

2026-03-117 min read

Results & Effectiveness