Outcomes after Weight Loss Surgery

Weight loss surgery outcomes are highly variable between different surgeons and programs. This is true for a wide variety of outcome parameters, including weight loss (reference), leak (reference), serious early postoperative complications (reference), and long-term complications such as acid reflux after gastric sleeve surgery (reference).

To understand the magnitude of the outcomes variation between different surgeons and programs, consider the findings of a recent 2017 study published in JAMA (Journal of the American Medical Association) entitled “Variation in Outcomes at Bariatric Surgery Centers of Excellence” (read abstract).

In this large (145,527 patients), high-quality review study the authors evaluated the rate of serious complications occurring within 30 days of weight loss surgery at 165 different bariatric surgery centers of excellence nationwide. What they found was a 17-fold variation (yes, 17-fold!) in the rate of complications (0.6% – 10.3%) across the 165 centers of excellence nationwide.
Outcomes vary between surgeons

Because weight loss surgery outcomes can be so variable between different programs, the key measure of surgeon/program quality is the surgeon’s/program’s record of actual patient outcomes.*

Our Weight Loss Surgery Outcomes

Dr. Oliak’s goal has always been to achieve great outcomes for his patients. To judge his success at achieving this goal, he has always prioritized closely tracking his patient/operation/outcomes data. He has been doing this since starting his career in 2002, and now has >2500 patients and their detailed operation/outcomes data in his database.

The weight loss surgery outcomes Dr. Oliak focuses most on are weight loss, serious early postoperative complications, and leak. For these outcomes parameters, Dr. Oliak’s statistics beat the published averages, often by a large margin.*
About our program

Serious Complications
For serious complications within one month of weight loss surgery, using the same methodology as in the JAMA study quoted above, Dr. Oliak’s rate is less than 1%. This statistic ranks in the top decile of the 165 accredited bariatric surgery centers of excellence evaluated in the JAMA study (abstract) quoted above.*

Gastric Sleeve Leak
The most feared complication after gastric sleeve surgery is leak. Dr. Oliak’s gastric sleeve leak rate is 0%. Published studies report the industry average leak rate to be 2.4% (reference), and individual surgeons report leak rates to be as high as 9% (reference).**

Gastric Sleeve Weight Loss
Dr. Oliak’s gastric sleeve patients average 75-80% EWL (excess weight loss) at 1-3 years after surgery. Published studies report the industry average gastric sleeve weight loss to be 55-65% EWL (reference).*

* Patient results vary after weight loss surgery. The weight loss outcomes quoted on this page are averages – individual patients can lose more or less weight than the average.

** Leaks can occur after gastric sleeve surgery. Past leak rates may not be indicative of future leak rates. Dr. Oliak’s 0% leak rate statistic applies to primary (non-revision) sleeve gastrectomy, primary (non-revision) laparoscopic gastric bypass, LAP-BAND® conversion to sleeve gastrectomy, and LAP-BAND® conversion to gastric bypass.

  • 0%
    leak rate**
  • 76%
    excess weight loss 1 year after sleeve*
  • 67%
    excess weight loss 10 years after bypass*

Learn more about weight loss surgery and our program

Schedule a free, no-obligation consultation with Dr. Oliak in Orange County – Brea or Irvine – today!

Free Consult


Free Consult

Call 714-582-2530 or submit the following information to request a free consult. If you have insurance coverage for weight loss surgery (or are self-pay), and you meet the BMI criteria for surgery, we will schedule you for a 30-40 minute educational consultation with Dr. Oliak.

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