Sleeve Gastrectomy
Weight loss after sleeve gastrectomy in numbers: the first year step by step.
The question patients ask most before surgery is: how much weight will I lose? Weight loss after sleeve gastrectomy varies from person to person, but real numbers give a clear picture. In this article we share the results of 53 patients who had a sleeve gastrectomy in a clinical study co-authored by Dr. Ahmed Shinkar. Their average weight before surgery was 157 kg.
💡 Key Takeaways
- Within 3 months, patients lost about 18% of their total body weight.
- By 6 months, they had lost more than half of their excess weight.
- After one year, they had lost about 78% of excess weight and 43% of total weight.
- Commitment to diet, exercise and follow-up makes the difference between patients.
Weight Loss After Sleeve Gastrectomy, Month by Month
The study published in the Journal of Gastrointestinal Surgery followed sleeve patients with super obesity for a full year. The medians were:
| Time | Weight | BMI | Excess weight loss |
|---|---|---|---|
| Before surgery | 157 kg | 57.1 | — |
| 3 months | 127 kg | 45.9 | 32.8% |
| 6 months | 107 kg | 39.8 | 51.6% |
| 12 months | 89 kg | 32.4 | 78.2% |
Put simply, the typical patient lost about 68 kg in the first year, moving from super obesity to close to Class I obesity.
Stages of Weight Loss After a Sleeve
Months 1–3
The fastest stage, driven by very small intake and hormonal changes such as lower hunger hormone.
Months 4–6
Weight keeps falling at a slightly calmer pace, and short plateaus may appear.
Months 7–12
Patients approach their target weight, and new habits become the foundation.
Plateaus are normal and do not mean the operation failed. Read about the weight-loss plateau after bariatric surgery and how to move past it.
Factors That Affect Weight Loss After a Sleeve
- Starting weight: higher weights lose more kilograms at first.
- Age: younger patients often lose weight faster.
- Diet: protein first, and avoid sugars and high-calorie drinks.
- Physical activity: daily walking and resistance training speed up results.
- Sleep and stress: poor sleep affects hunger hormones.
How It Compares With Mini Gastric Bypass
In the same study, weight loss was similar between the sleeve and mini gastric bypass for the first 6 months. At 12 months, the mini bypass pulled ahead (86.6% vs 78.2% of excess weight). Still, the sleeve result is excellent, with fewer vitamin and mineral deficiencies. See the details in Sleeve or Mini Gastric Bypass for Super Obesity.
Tips for the Best Weight Loss After a Sleeve
- Follow the diet stagesStick to the diet after sleeve gastrectomy without rushing.
- Drink water regularlyBetween meals, not with them.
- Move every dayStart with walking, then add resistance training gradually.
- Keep up with follow-upRegular visits and blood tests help catch problems early.
FAQs About Weight Loss After Sleeve Gastrectomy
How much weight is lost in the first month after a sleeve?
It depends on starting weight, but people with super obesity may lose 10 to 15 kg or more in the first month. In the study, patients lost about 30 kg in the first 3 months.
When does weight loss stop after a sleeve?
Weight loss usually continues for 12 to 18 months, then weight gradually stabilizes.
Is a sleeve suitable for super obesity?
Yes. Study patients with a BMI over 50 lost about 78% of their excess weight within a year.
What should I do if my weight stalls for weeks?
Plateaus are normal. Review your protein, water and activity, and see your doctor if the stall lasts a long time.
Start Your Weight Loss After Sleeve Gastrectomy
Book a consultation with Dr. Ahmed Shinkar to find out the expected result in your case.
Book Your ConsultationDisclaimer: This article is for educational purposes only and does not replace a consultation with a qualified physician.