The short answer: the Allurion Gastric Balloon is a temporary, non-surgical treatment. It is swallowed as a capsule, stays in your stomach for around four months, and supports an average loss of 10–15% of your total body weight. A gastric sleeve is keyhole surgery under general anaesthetic that permanently removes around 75–80% of the stomach, and typically leads to a loss of 60–70% of excess weight over two years.
In general, the balloon suits people who want medical support without surgery and have a moderate amount of weight to lose. The sleeve suits people with more weight to lose who are looking for a permanent change.
If you are reading this article, there is a good chance you have already been thinking about your weight for some time.
You may have tried diets, exercise programmes or weight-loss medication. You may have lost weight in the past, only to find it difficult to keep off. Or perhaps you have simply reached a point where you feel ready to explore a different approach.
Whatever has brought you here, considering taking action is an important and positive first step. And you do not need to have all the answers yet.
One of the most common questions we hear at Auralia is: “Should I choose a gastric balloon or a gastric sleeve?”
The honest answer is that it is different for everyone. There is no perfect weight-loss treatment and no single solution that is right for every patient. Your starting weight, your health, your previous weight-loss experience, your personal goals and how you feel about surgery all influence which option may be most appropriate.
Two of the weight-loss surgery options available at Auralia are the Allurion Gastric Balloon and gastric sleeve surgery. Both are designed to support meaningful weight loss, but they work in very different ways.
Gastric sleeve vs gastric balloon: what is the difference?
The simplest distinction is this: the Allurion Gastric Balloon is a temporary, non-surgical weight-loss treatment, while a gastric sleeve is a surgical and essentially permanent change to the stomach.
The Allurion Balloon takes up space inside the stomach, helping you feel fuller sooner and for longer. It is swallowed as a capsule and filled with water once its position has been confirmed. There is no surgery, endoscopy or anaesthesia required for routine placement. After approximately four months, the balloon empties and passes naturally through the digestive system.
A gastric sleeve, also known as a sleeve gastrectomy, is performed using laparoscopic or keyhole surgery under general anaesthetic. Approximately 75–80% of the stomach is removed, creating a much smaller, sleeve-shaped stomach. This limits the amount of food you can eat at one time, and it also reduces production of ghrelin — sometimes called the “hunger hormone” — which helps to reduce appetite.
How does the Allurion Gastric Balloon work?
For someone who wants medical support with weight loss but does not feel ready for surgery, the Allurion Gastric Balloon may be worth exploring.
The balloon is contained within a capsule that you swallow during an appointment with your doctor. Once an X-ray confirms it is correctly positioned, it is filled with approximately 550ml of water. Placement takes about 15 minutes, and it is a day case — you go home the same day.
There is normally no surgery, no general anaesthetic and no endoscopy for placement or removal. The balloon remains in your stomach for approximately four months before naturally emptying and passing through your digestive system.
During that time it takes up space in your stomach, helping you feel full more quickly and for longer. That can make it easier to reduce portion sizes while you begin to develop healthier eating and lifestyle habits. Most people return to normal activity within a day or two.
How much weight can you lose with a gastric balloon?
Patients typically lose an average of approximately 10–15% of their total body weight over around four months.
For those who want to go further, a second consecutive balloon can be used as a sequential programme over 12 months, with an average total weight loss of around 23%. This is often the option we discuss with patients who like the idea of avoiding surgery but have more weight to lose than a single balloon would address.
The balloon itself, though, is only part of the picture. At Auralia it comes with a structured support programme: dietitian guidance and supplement advice, access to exercise, lifestyle and cooking classes through the Auralia app, scheduled follow-ups and unlimited aftercare appointments.
The aim is not simply to lose weight while the balloon is in place. It is to use that period to establish healthier habits that continue long after the balloon has passed.
How does gastric sleeve surgery work?
For people seeking more significant and sustained weight loss, gastric sleeve surgery may be more appropriate.
During the procedure, approximately 75–80% of the stomach is surgically removed. The remaining stomach is considerably smaller, meaning you feel full after eating much smaller quantities of food.
The operation also removes the part of the stomach responsible for producing much of the body’s ghrelin. This helps reduce hunger and food cravings, as well as restricting the amount you are physically able to eat — which is why many patients describe a genuine change in appetite rather than simply eating less through willpower.
At Auralia, gastric sleeve surgery is performed laparoscopically under general anaesthetic in our fully accredited private hospital in Dublin. Surgery typically takes approximately 40–60 minutes, and you would normally stay in hospital for one night.
Patients can return to work in around 10 days, although recovery varies from person to person and can take longer depending on the nature of your work. Your team will advise you based on your job and how your recovery is progressing.
How much weight can you lose with a gastric sleeve?
Everyone is different, but patients may typically lose around 60–70% of their excess weight over a two-year period.
Results vary depending on your starting weight, age, underlying health and — importantly — how closely you follow the recommended nutritional and lifestyle programme. Because gastric sleeve surgery permanently changes the size of the stomach, it should be considered a long-term and essentially permanent treatment rather than a temporary intervention.
If you would like more detail on the surgical side specifically, we cover how safe gastric sleeve surgery is and the risks and complications of bariatric surgery in separate guides.
Gastric balloon vs gastric sleeve: at a glance
| Allurion Gastric Balloon | Gastric Sleeve | |
| Type of treatment | Non-surgical | Bariatric surgery |
| General anaesthetic | No | Yes |
| Endoscopy for routine placement | No | Not applicable |
| What happens to the stomach | No permanent anatomical change | Approximately 75–80% of the stomach removed |
| How it works | Occupies space in the stomach to encourage earlier fullness | Reduces stomach capacity and lowers hunger hormones |
| How long it remains | Approximately 4 months | Essentially permanent |
| Typical weight-loss measure | Approx. 10–15% of total body weight (approx. 23% with a sequential balloon over 12 months) | Approx. 60–70% of excess weight over the first year |
| Procedure time | Approx. 15 minutes | Approx. 40–60 minutes |
| Hospital stay | Day case | One night |
| Typical return to work | Most return to normal activity within 1–2 days | Many with sedentary jobs return in around 10 days |
| Auralia support | Dietitian programme, app access, unlimited aftercare | Comprehensive bariatric aftercare programme |
One important caveat when reading that table. The two weight-loss figures are measured in different ways. Gastric balloon results are generally expressed as a percentage of total body weight, while gastric sleeve results are usually expressed as a percentage of excess weight lost. They should not be compared directly as though they were the same measurement — a “15%” and a “65%” are not describing the same thing.
Balloon or sleeve: which one could be right for me?
This is where the conversation becomes personal.
If your goal is to lose a more moderate amount of weight and you would strongly prefer to avoid surgery, the Allurion Gastric Balloon may be worth considering.
If you have a greater amount of weight to lose, have struggled with obesity over a prolonged period, or are looking for a more significant and permanent intervention, a gastric sleeve may be more appropriate.
Your decision should not be based on a website, a friend’s experience, or simply on which procedure promises the greatest amount of weight loss. It should begin with you.
Your bariatric team will want to understand your weight history, your health, what you have already tried, your relationship with food, your expectations and what you ultimately want to achieve.
Sometimes the most important question is not “Which procedure is best?” It is “Which approach gives me the best opportunity to reach my goals and maintain them?”
It is also worth knowing that these are not your only two options. If you are weighing up surgical routes specifically, we compare a gastric sleeve and a gastric bypass, and look at how a gastric band compares with the sleeve, in separate guides.
Success is about more than the number on the scales
Whether you choose a balloon or a sleeve, long-term success depends on more than the treatment itself. Nutrition, activity, behaviour and ongoing support all matter, and staying active after weight-loss surgery is a significant part of maintaining your results.
For some people, success means reaching a particular weight. For others, it means walking further without becoming breathless, playing with their children, or simply feeling that their weight is no longer controlling their life. Understanding your personal “why” is an important part of choosing the right pathway.
Frequently asked questions
Neither is better in absolute terms — they suit different situations. The balloon is a temporary, non-surgical option that supports an average loss of 10–15% of total body weight over four months. The sleeve is permanent surgery that typically achieves 60–70% of excess weight loss over two years. The right choice depends on how much weight you have to lose, your health and how you feel about surgery.
For many people, yes. The Allurion Balloon is designed as a non-surgical option and requires no general anaesthetic, no incisions and no endoscopy for routine placement. Whether it is suitable for you depends on your BMI, your health and your goals, which your bariatric doctor will assess at your consultation.
Approximately four months. A time-activated release valve then opens automatically, allowing the balloon to empty and pass naturally through the digestive tract. No procedure is needed to remove it.
The operation itself typically takes approximately 40 to 60 minutes. It is performed laparoscopically under general anaesthetic, and most patients stay in hospital for one night.
No. Gastric sleeve surgery permanently removes around 75–80% of the stomach, so it should be considered a permanent change. This is one of the most important differences between the two options and is worth discussing carefully at your consultation.
Gastric sleeve surgery generally leads to greater and more sustained weight loss. However, the two are measured differently — balloon results are expressed as a percentage of total body weight and sleeve results as a percentage of excess weight — so the headline figures are not directly comparable.
No. Most patients arrive undecided, and that is completely normal. The purpose of the consultation is to review your history and goals together and to give you clarity, not to have you commit to a procedure in advance.
You do not have to make this decision alone
If you are comparing a gastric sleeve with a gastric balloon, researching your options is already a positive step.
You do not need to decide today. And you do not need to arrive at your first appointment already knowing the answer.
At Auralia, our role is to listen, understand what you want to achieve, and help you explore the options that may be appropriate for you. Our bariatric team provides both non-surgical and surgical weight-loss treatments, which means the conversation can start with your needs rather than with a particular procedure.
If you are ready to explore your options, book your complimentary weight-loss consultation. Our team will talk through your goals, explain the differences between the Allurion Gastric Balloon and gastric sleeve surgery, answer your questions, and help you understand which pathway may be most appropriate for you.
You do not need to have made your decision. You just need to be ready to start the conversation.
