It depends on the procedure and it will vary among patients because each person has a different BMI (body mass index) due to different heights and weights.

For weight loss after gastric sleeve surgery, clinical studies show the following averages:

  • 65-80% excess weight loss per national averages over 18-24 months after sleeve gastrectomy.
  • 55.4% excess weight loss reported in 24 studies (follow-up periods were 3-60 months).1
  • 66% excess weight loss reported in a clinical trial (follow-up period was 36 months).3
  • Most gastric sleeve patients can expect to lose 25-30 pounds in the first month after surgery and reach their weight goal within 9 months post surgery.

 

For weight loss after gastric bypass surgery, clinical studies show the following averages.

  • Gastric bypass patients lose about 70% of their excess body weight after surgery (first 24 months).
  • Studies show gastric bypass patients are able to keep > 61% of the excess body weight off for up to 20 years.