Ten-year trial data, the things nobody mentions before you book, and why some people say the operation ruined their life.
Written by a surgeon who would rather lose a booking than have a patient discover any of this afterwards.
Two randomised trials have followed sleeve and bypass patients for ten years. They are the most honest numbers there are, and they are less flattering than any before-and-after gallery.
| At ten years | Gastric sleeve | Gastric bypass | Source |
|---|---|---|---|
| Excess weight still off (median) | about 44% | about 51% | SLEEVEPASS, JAMA Surgery 2022 |
| Total body weight lost (mean) | about 26% | about 28% | SM-BOSS, JAMA Surgery 2025 |
| Oesophagitis on endoscopy | about 31% | about 7% | SLEEVEPASS |
| Taking acid-suppressing medication | about 64% | about 36% | SLEEVEPASS |
Read together: both operations work and keep working, the bypass holds slightly more weight off, and the sleeve's long-term price is reflux. That is why we ask about reflux before anything else and recommend a gastric bypass when it is already significant.
The first two days hurt, mostly in the shoulders, from the gas used to inflate the abdomen. One of our own reviewers called it intense. Walking is what shifts it.
You are home, on liquids, tired, and the excitement has gone. Almost everyone has a low week. It passes.
Between months three and six many patients shed hair. It is temporary and tied to rapid weight loss and protein intake. More in the surgeon's guide to hair loss after gastric sleeve surgery.
B12, iron and vitamin D, with periodic blood tests. Not for the first year: for good.
Faster and harder, on much less. Some patients find drinking becomes a problem it never was before.
If eating was how you coped, the sleeve takes the tool away without replacing it. This is the commonest reason for the “it ruined my life” posts.
After a large loss, expect it on the abdomen, arms and thighs. It is the price of the weight you carried.
10–20% develop new or worse reflux over the years. It is treatable, and if it is not controlled the sleeve can be converted to a bypass.
Usually habits, not a failed operation. The surgeon's approach is set out in weight regain after gastric sleeve.
The removed stomach does not come back. A later correction is a second operation, not an undo.
Read enough forums and you will find the stories. They are real, and they follow a pattern: the patient was not screened for reflux, nobody explained the first weeks, the clinic disappeared after the flight home, or food had been doing an emotional job that nothing replaced.
If a sleeve stops working years later, the options are on the gastric sleeve revision page. What the first two years look like in photographs is on before and after.
In the SLEEVEPASS randomised trial, patients had kept off a median of about 44% of their excess weight ten years after a sleeve, against about 51% after a bypass. Most are far below their starting weight, some have regained part of it, and reflux is the main long-term issue.
The main one is acid reflux. In SLEEVEPASS, oesophagitis was found in about 31% of sleeve patients at ten years against 7% after bypass, and more sleeve patients were taking acid-suppressing medication. Vitamin deficiencies can also develop if supplements are stopped.
Eat large portions, drink with meals in the early months, or stop your vitamins. Alcohol also hits faster and harder. Almost everything else returns: normal food in small amounts, exercise, pregnancy after the first twelve to eighteen months.
Most do not, but some do, usually because of reflux, regain, or because nobody prepared them for the first difficult weeks. Regret is much rarer in patients who knew what to expect, which is the reason this page exists.
No. The removed part of the stomach does not come back. A sleeve can be revised, most often by converting it to a bypass, but it cannot be undone.
Some regain between years two and five is common, and it is usually tied to eating habits rather than surgical failure. If it becomes significant there are options, from medication to revision surgery.
It can, over years of overfilling. A stretched sleeve can be re-sleeved or converted to a bypass; the decision is made by endoscopy.
Good: that is the right way round. Send your height, weight, age and whether you have reflux, and the surgeon tells you whether a sleeve, a bypass or neither is the honest answer.
Reflux, emotional eating, alcohol, a previous operation: tell him, and get an answer that takes it into account.
WhatsApp is the quickest route. You write to the surgeon himself, not a call centre or an agency.
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