Gastric sleeve surgery has been proven to be effective for weight loss. Amount of weight loss, however, varies between different surgeons/programs. Read below about our gastric sleeve weight loss statistics, and about how our results compare to what’s reported in the published gastric sleeve literature.

Gastric Sleeve Weight Loss

Before discussing weight loss results, it is important to understand how weight loss after surgery is described.

The most common way to describe weight loss after surgery is by percent of excess weight lost (%EWL). Excess weight is the amount of weight over ideal weight. Ideal weights are derived from the Metropolitan Life Insurance Company height/weight tables.

See the table at the bottom of this page for a tabulation of ideal weights.

Gastric Sleeve Weight Loss – Our Results

Dr. Oliak’s gastric sleeve weight loss outcomes are as follows: average 75% EWL at 1 year after surgery, average 77% EWL at 2 years after surgery, and average 74% EWL at 3 years after surgery.*

Dr. Oliak’s sleeve gastrectomy weight loss statistics are better than the industry average weight loss statistics (see table and discussion below).* Industry average gastric sleeve surgery weight loss is reported to be 55-60% EWL at 1-3 years after surgery.*

Why are our weight loss outcomes better than the industry averages? Because we prioritize high-quality surgery, thorough patient education, frequent follow-up after surgery, and ongoing support.

Our program

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Dr. Oliak’s gastric sleeve technique


Our Gastric Sleeve Weight Loss Statistics*

59% EWL after 6 months

75% EWL after 1 year

77% EWL after 2 years

74% EWL after 3 years

* The weight loss results above are averages. Individual patients can lose more or less weight than the average. Our %EWL (percent excess weight loss) statistics are for all gastric sleeve operations completed by Dr. Oliak through mid 2018.

Our Gastric Sleeve Weight Loss Statistics Compared to Published Literature

Time after surgery Gagner et al*
(average %EWL)
Fischer et al*
(average %EWL)
Fischer et al*
(%EWL range by
surgeon/program)
Our Statistics*
(average %EWL)
1 year 59.3% 56% 42-78% 75%
2 years 59.0% 64% 46-75% 77%
3 years 54.7% not reported not reported 74%

* The weight loss results above are averages. Individual patients can lose more or less weight than the average. Our %EWL (percent excess weight loss) statistics are for all gastric sleeve operations completed by Dr. Oliak through mid 2018. Gagner et al reported average %EWL for 130 surgeons and 46,133 gastric sleeve operations. Fischer et al compiled data from 123 published gastric sleeve weight loss studies (12,129 gastric sleeve operations), and reported average %EWL, and %EWL range by surgeon/program.


Gastric Sleeve Weight Loss – Published Studies

There have been 100s of studies published on gastric sleeve weight loss, by 100s of surgeons. The quick summary of the published literature is that gastric sleeve surgery is effective for weight loss, but the amount of average weight loss varies between different surgeons and programs.*

Because the published studies are quite variable in what they report, several researchers have published review studies. Review studies compile data from numerous other studies to get a more accurate big picture view.

Fischer et al published a review study on gastric sleeve weight loss that compiled data from 123 published gastric sleeve weight loss studies with a total of 12,129 gastric sleeve patients. The authors reported overall average weight loss to be 56% EWL (excess weight loss) at 1 year, and 64% EWL at 2 years.*

Fischer et al also reported the variation in average weight loss across the 123 studies. At 1 year after surgery, average weight loss varied between studies (meaning between surgeons/programs) from 42% EWL to 78% EWL, and at 2 years, average weight loss varied from 46% EWL to 75% EWL.*

This variation between the different studies is significant. The difference between 42% EWL and 78% EWL is 36 pounds for a typical patient who starts out 100 pounds over ideal weight. This review study shows that some gastric sleeve surgeons/programs achieve much better weight loss outcomes than others.*

Another review study by Gagner et al compiled gastric sleeve weight loss data from 130 surgeons, and 46,133 sleeve gastrectomy operations. This study is a little different than the Fischer study because Gagner et al compiled data from individual surgeons given to him by the individual surgeons. Fischer et al compiled data extracted from other published studies.

Despite the different methodology, the results of the Gagner study are similar to the results of the Fischer study. Gagner et al reported average gastric sleeve weight loss for the 130 surgeons to be 59.3% EWL at 1 year, 59.0% EWL at 2 years, and 54.7% EWL at 3 years.*

Gagner et al did not report individual surgeon data, but he did report that the standard deviation for average weight loss for the 130 surgeons was +/- 19%. Standard deviation is a measure of variation around the average, and 19% is a large number. This indicates a large variation in weight loss outcomes between the different surgeons, similar to Fisher et al’s findings.*

Long-Term Gastric Sleeve Weight Loss – Published Studies

There have been many fewer published studies on long-term weight loss (5+ years) after sleeve gastrectomy, so the data are not as robust as for short-term weight loss (1-3 years). There are sufficient data to draw some conclusions on overall average long-term gastric sleeve weight loss, but not enough to draw conclusions about variation between different surgeons/programs.

Golzarand et al published a review study in 2017 that compiled long-term weight loss data for gastric sleeve, gastric bypass, and gastric banding from 80 published studies. Golzarand et al reported overall average weight loss at 5 years or more after gastric sleeve surgery to be 53% EWL.*

This result for the sleeve gastrectomy operation is consistent with what long-term studies report for gastric bypass surgery – patients maintain, on average, most of their initial weight loss over time.*

* The weight loss statistics on this page are averages. Individual patients can lose more or less weight than the average.


Ideal Body Weights for Men and Women

Women (height ft./in.) Ideal Weight* (pounds) Men (height ft./in.) Ideal Weight* (pounds)
5’0″ 122
5’1″ 125
5’2″ 128
5’3″ 131
5’4″ 134 5’4″ 143
5’5″ 137 5’5″ 145
5’6″ 140 5’6″ 148
5’7″ 143 5’7″ 151
5’8″ 146 5’8″ 154
5’9″ 149 5’9″ 157
5’10” 152 5’10” 160
5’11” 155 5’11” 164
6’0″ 158 6’0″ 167
6’1″ 171
6’2″ 175
6’3″ 179
6’4″ 183

* Ideal weights above are derived from the Metropolitan Life Insurance Company height/weight tables, 1983, New York, New York. Ideal weights above are the midpoint weights from the medium frame size weight range. Weights include 3-5 pounds of clothes. Heights assume no shoes.

  • 75% excess weight loss 1 year*
  • 77% excess weight loss 2 years*
  • 74% excess weight loss 3 years*

Gastric Sleeve before & after

See more
  • Alan
  • Procedure: Gastric Sleeve
  • Weight Lost: 115 lbs
  • Excess Weight Lost: 91%
  • Disclaimer: Individual results vary
My weight loss journey has completely changed my life. I feel so much better going out and spending time with…
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