Types of Bariatric Surgery - Full Comparison

Reviewed by: Gregg H. Jossart, MD, FACS

The types of bariatric surgery you should consider depend on a number of factors, including how much weight you want to lose, which health problems you are looking to improve, risk level and cost.

There is no “one size fits all” procedure, so we’ll help you determine which ones best fit your goals.


The Fundamentals of All Types of Bariatric Surgery: Restriction Vs. Malabsorption

All types of bariatric surgery work in one of 3 ways…

  1. Restrictive surgeries shrink the size of the stomach which reduces the amount of food it can hold. This makes you feel full when eating much sooner than you did before surgery. The established restrictive procedures include…
    • Adjustable gastric banding (lap band surgery)
    • Gastric sleeve
    • Intragastric balloon (gastric balloon)
  2. Malabsorptive surgeries rearrange and/or remove part your digestive system which then limits the amount of calories and nutrients that your body can absorb. Treatments with a large malabsorptive component result in the most weight loss but tend to have higher complication rates. There are no longer any purely malabsorptive operations being performed.
  3. Combination – When surgery combines both restrictive and malabsorptive techniques, it is know as a “combination” procedure (although some surgeons also refer to this type of surgery as malabsorptive). Most types of bariatric surgery carry at least a small element of both components, but the following established surgeries achieve a notable portion of weight loss from each…
    • Gastric bypass (more malabsorption than the restrictive procedures listed above, but works primarily through restriction)
    • Duodenal switch (more malabsorption – the sleeve stomach is the restrictive portion and the intestinal bypass (duodenal switch) is the malabsorptive component)

Complete List of Available Weight Loss Surgery Procedures by Category

Gastric Banding vs Stomach Stapling

Many patients now think about surgery in terms of "banding" versus "stapling".

Gastric banding, also called stomach banding or Lap Band surgery, is the process of placing a synthetic band around the upper portion of the stomach. It works by creating a small "pouch" at the top of the stomach just below the esophagus, thus dramatically reducing the amount of food a patient can eat.

The primary procedure that utilizes stomach banding is gastric banding surgery, more commonly known as lap band surgery.

Stomach stapling, on the other hand, is used to either section off or seal the part of the stomach that remains after the other portion is removed. Procedures that utilize stapling include:

  • Roux-en-Y gastric bypass
  • Duodenal switch
  • Gastric sleeve surgery

In contrast, stomach stapling should be considered permanent. It tends to result in greater and more consistent weight loss among patients along with a greater reduction in obesity-related health problems, but it may carry a higher risk of complications.

Continue reading this page for more information about each procedure.

There are 3 categories of weight loss surgery procedures:

  1. Established and Widely Accepted – performed by the largest number of credible/experienced surgeons and most likely to be covered by insurance
  2. Outdated and/or Generally Rejected – typically not recommended by top surgeons due to findings that other procedures are safer and/or more effective
  3. Experimental / Investigational – procedures that look promising based on short-term research but need longer-term research to confirm safety and effectiveness; usually not covered by insurance

Established & Widely Accepted Types of Bariatric Surgery

We recommend scrolling down to review this entire page, but you can also click the following links to jump further down the page to your Established Procedure of interest…

Open vs Laparoscopic Types of Bariatric Surgery

Most bariatric procedures can be performed either open or laparoscopically. Open surgery may be required in rare cases (such as a build up of scar tissue from previous operations), although with a good surgeon laparoscopic surgery is usually a much better option. It results in shorter hospital stays, lower infection rates and smaller scars.

Open surgeries are performed by making a relatively large incision in the abdomen and carrying out the operation by direct observation through the open incision. 

While many surgeons still perform open bariatric surgery successfully, these surgeries have a longer recovery time, a bigger risk of infection and a higher risk of adhesions (internal scarring that can lead to other problems). Obese patients’ bodies often have more difficulty healing which can complicate things further.

With open bariatric surgery, you should expect to be in the hospital for up to 5 days or more.

With laparoscopic weight loss surgery, the surgeon makes five or six small incisions that are just big enough to pass surgical instruments through. Smaller incisions mean less healing time, so you could leave the hospital in as soon as 2 days or less.

In addition to other medical instruments, the incisions are used to insert a special camera. The surgical camera projects the inside of the patient’s body onto a screen, and the surgeon uses that image to perform the surgery.

Outdated and/or Generally Rejected Types of Bariatric Surgery

The following links will take you to dedicated pages about each Outdated/Generally Rejected procedure…

Experimental Types of Bariatric Surgery

The following experimental procedures seem the most promising based on the limited amount of published and peer-reviewed research (listed in alphabetical order)…

  • EndoBarrier Gastrointestinal Liner
  • Gastric Plication Surgery
  • Implantable Maestro System
  • Primary Obesity Surgery Endolumenal (POSETM) Procedure
  • Transoral Gastric Volume Reduction (TGVR)

For more information about each of the investigational procedures, see our Experimental Weight Loss Surgery Procedures page.

The remainder of this page reviews only the more established and widely accepted types of bariatric surgery.

Established Types of Bariatric Surgery

Gastric Bypass Surgery (Roux-en-Y)

gastric bypass surgery

Gastric bypass, also called Roux-en-Y or RNY for short, is the most commonly performed bariatric surgery in the United States.

An entire section of our web site is dedicated to this popular and effective procedure, so we’ll save most of our discussion about it for those pages (link is below). The surgery is mainly restrictive in nature, but it also has elements of malabsorption.

From a very high level perspective, to perform gastric bypass surgery the surgeon…

  1. Cuts and staples the top portion of the stomach to create a small pouch at the end of the esophagus
  2. Leaves the remainder of the stomach attached to the top of the small intestines
  3. Goes further down the small intestine, cuts it, and attaches it to the pouch
  4. Takes the end of the small intestine that is still connected with the non-pouch portion of the stomach and attaches it to the bottom of the “Roux limb.” This allows the digestive juices produced by the stomach to meet up with the food in the intestines.

It’s much more easily understood by watching a video…

Most patients have successful long term weight loss with minimal weight regain. However, over time some patients’ stomach pouch or stoma (the opening between the stomach and small intestines) can stretch causing significant weight regain.

In these cases, gastric bypass revision surgery may be appropriate.

See our Laparoscopic Gastric Bypass Surgery page for all the details specific to this surgery.

Alternatively, contact an experienced local qualified surgeon. Most qualified surgeons offer free seminars and/or free one-on-one consultations that teach you about your options and their office’s specific results.

Click here to find and schedule a free in-person seminar or one-on-one consultation with a qualified weight loss surgeon in your area.

Adjustable Gastric Banding (Lap Band Surgery)

lap band surgery

This is the second most popular U.S. bariatric surgery procedure and is restrictive in nature. It’s been used in Europe since the 90’s, but wasn’t approved by the FDA in the States until 2001.

The lap band surgery procedure involves the sewing of a silicone and Silastic band around the top of the stomach. A balloon around the inner surface of the band (imagine the inside of a bicycle tire) is connected to a tube that leads to a half-dollar-sized port above the abdominal muscles but below the skin.

During follow up visits, your doctor will add or remove saline solution (salt water) to make it tighter or looser. The tighter it is, the less hungry you feel and vice-versa.

Here’s the procedure…

There is also an entire section devoted to this procedure. See Lap Band Bariatric Surgery: Complete Reference Guide to learn more.

To review the specific differences between gastric bypass and lap band surgery, see our Lap Band vs Gastric Bypass page.

Alternatively, contact an experienced local qualified surgeon that performs both lap band and gastric bypass surgery. Most qualified surgeons offer free seminars and/or free one-on-one consultations that teach you about your options and their office’s specific results.

Click here to find and schedule a free in-person seminar or one-on-one consultation with a qualified weight loss surgeon in your area.

Gastric Sleeve Surgery (Vertical Sleeve Gastrectomy)

gastric sleeve surgery

The Vertical Sleeve Gastrectomy (VSG), also called gastric sleeve surgery, is the newest addition to the short list of Established & Generally Accepted Types of Weight Loss Surgery.

It extremely effective and safe as compared with the other procedures. As a result, the popularity of VSG has skyrocketed in recent years, to the point that it appears to be overtaking gastric bypass as the new "gold standard" procedure.

The procedure is performed by dividing the stomach to create a long pouch that connects the esophagus to the small intestine. The pouch is stapled and the rest of the stomach is removed…

Read more on our Gastric Sleeve Surgery page.

Alternatively, contact an experienced local qualified surgeon. Most qualified surgeons offer free seminars and/or free one-on-one consultations that teach you about your options and their office’s specific results.

Click here to find and schedule a free in-person seminar or one-on-one consultation with a qualified weight loss surgeon in your area.

Biliopancreatic Diversion with Duodenal Switch (BPD/DS) (Duodenal Switch)

Duodenal Switch Surgery (DS)

More simply referred to as a Duodenal Switch, this procedure could be classified as a Gastric Bypass/Gastric Sleeve combination with a twist….

  1. A large portion of the stomach is removed to create a cylinder-shaped pouch connecting the esophagus to the top of the small intestine.
  2. The top of the small intestine is cut, but the surgeon leaves part of the duodenum, or the top part of the small intestine where most chemical digestion occurs, attached to the stomach.
  3. The surgeon then cuts the small intestine several feet down. The part that is still attached to the large intestine (or colon) is connected to the duodenum.
  4. The loose part of the small intestine (the part that wasn’t just attached to the stomach) is then attached to the small intestine so the digestive juices it creates can mix with the food coming from the stomach.

Since the stomach is shrunk and only a small portion of the intestine has a chance to digest food before it enters the colon, the duodenal switch procedure is both restrictive and malabsorptive. But this surgery is effective mainly because of malabsorption.

See our Duodenal Switch page for all of the details.

Alternatively, contact an experienced local qualified surgeon. Most qualified surgeons offer free seminars and/or free one-on-one consultations that teach you about your options and their office’s specific results.

Click here to find and schedule a free in-person seminar or one-on-one consultation with a qualified weight loss surgeon in your area.

Intragastric Balloon (Gastric Balloon)

Intragastric Balloon

The gastric balloon procedure can be thought of a "middle of the road" option between diet/exercise and the more aggressive surgeries listed above. Gastric balloon patients can expect to lose more weight with the balloon than with diet and exercise but less weight than with the more aggressive procedures.

The procedure is performed as follows:

  1. Surgeon numbs throat using a spray
  2. Patient may or may not receive a sedative
  3. Plastic mouth guard is inserted in patient’s mouth for the scope to pass through
  4. Scope is passed through mouth and into stomach
  5. Scope is removed and balloon is passed into patient’s stomach
  6. Balloon is inflated with air or saline solution (depending on balloon type)
  7. Scope is passed into stomach again to confirm proper balloon positioning

Since it usually must be removed within 6 months, the balloon is only a temporary solution intended to "jump start" a long-term medically-supervised diet and excercise program.

See our Gastric Balloon page for all of the details.

Alternatively, contact an experienced local qualified surgeon. Most qualified surgeons offer free seminars and/or free one-on-one consultations that teach you about your options and their office’s specific results.

Click here to find and schedule a free in-person seminar or one-on-one consultation with a top gastric balloon surgeon.

Comparison of the Established Types of Bariatric Surgery

Generally speaking, the types of bariatric surgery that result in more weight loss are often accompanied by higher risk and additional lifestyle changes.

The following shows a high level comparison of all Established/Generally Accepted types of bariatric surgery. Below the chart we’ll get into a summary of the positives and negatives of each procedure and how they compare to one another.

Types of Bariatric Surgery
(click links for more info)
Category (explained above)
Combination (primarily restrictive)
Types of Bariatric Surgery
(click links for more info)
Average Long-Term
Excess Weight Lost
(approx. %)
Ranges from 26% to 46% depending on balloon type
Extremely variable – average is about 50%, but ranges from 25% to 80%

Summary of Positives & Negatives of Established Weight Loss Surgery Procedures
(click links below to jump to pages dedicated to each surgery)

Following is a comparison of the established types of bariatric surgery…

Roux-en-Y Gastric Bypass

Patients typically don’t lose as much weight after laparoscopic gastric bypass surgery as they do after the more complicated duodenal switch, but 60 to 70% of excess weight lost after gastric bypass is substantially better (and more consistent among patients) than what is expected following gastric banding.

The presence of dumping syndrome is a significant difference versus other procedures. While the symptoms are extremely uncomfortable, many patients feel that they help to keep their diet and long-term weight loss on track.

In addition, the malabsorptive component of gastric bypass can lead to malnutrition issues, so careful and ongoing attention should be paid to diet supplementation. However, malnutrition risks are much less after gastric bypass than after the duodenal switch.

Adjustable Gastric Banding (Lap band Surgery)

Lap band surgery has an impressively low rate of serious complications and is the only well-researched surgery that is completely reversible (note: we’re keeping an eye on the investigational gastric plication surgery).

While the average 50% of excess weight lost is a decent percentage, the amount each patient could lose ranges from below 25% to over 80%. It also has a much higher rate of minor complications and reoperations than any other procedure. 

The number of doctor visits after surgery is another consideration. Patients see their surgeon up to 10 times or more in the two to three years following surgery for band adjustments.

Concerningly, longer-term research is showing an alarmingly high rate of lap band failures and required reoperations – as many as one in three patients. For these reasons, some surgeons are choosing to no longer perform adjustable gastric banding surgery.

However, Lap Band surgery still has many champions due to the fact that it’s (a) reversible and (b) much less invasive than the other established procedures.

See our Lap Band vs Gastric Bypass page for a full comparison of these two popular types of bariatric surgery.

Duodenal Switch

The Biliopancreatic Diversion with Duodenal Switch, or “Duodenal Switch” for short, deserves more credit and attention than it’s been given by those seeking bariatric treatment. On average, it results in more weight loss than any other procedure.

And although it carries the highest risk of complications, it’s mortality risks are on par with other procedures and it may be the best procedure for those with a body mass index of 50 or over (“super-obese”) in terms of average weight loss and elimination of obesity health problems.  (See our How to Calculate BMI page for more about body mass index.)

However, its higher rate of serious complications and the amount of malabsorption that it causes command careful consideration by the patient and surgeon before moving forward.

Gastric Sleeve (Vertical Sleeve Gastrectomy)

Gastric sleeve surgery has recently caught up with gastric bypass in terms of popularity and adoption by surgeons; it carries the low risks of gastric banding with the higher weight loss associated with gastric bypass.

Compared with gastric bypass, it appears to carry a lower rate of complications and reoperation. But recent research shows that it may not be as effective at resolving obesity-related health problems such as curing type 2 diabetes mellitus, hypertension, hypercholesterolemia, gastroesophageal reflux disease, and arthritis.4

The main concern is that the pouch could stretch over time, although there are several minimally invasive options available for reducing the pouch size down the road if necessary.

Intragastric Balloon (Gastric Balloon)

The gastric balloon is the newest member of the "most common weight loss surgery procedures" family. It can be thought of the procedure that "bridges the gap" between pure diet and exercise and the more aggressive bariatric surgery procedures reviewed above. It is the only procedure of the group that is non-invasive; the balloon is inserted into the stomach through the mouth rather than requiring surgery. Its less aggressive nature also results in lower risk and lower weight loss than the other procedures.

Since most types of balloons must be removed after 6 months, this should be considered a short-term option to either jump-start a more intensive diet and exercise program or as a way to lose weight before one of the more aggressive procedures to reduce the risk of complications.

The intragastric balloon has not been around as long as the others. As a result, more long-term studies are needed before we’ll feel comfortable elevating the procedure from a ‘B’ to an ‘A’ research ranking.

However, current study results are promising, especially if your expectations about weight loss and the long-term affect are appropriate.


Your individual situation will determine which types of bariatric surgery are right for you, but following is a general summary…

Roux-en-Y Gastric bypass has a relatively low complication rate compared with its high levels of excess weight loss and significant improvement in co-morbidities. Its popularity also means that there are more surgeons out there with enough procedures under their belt to improve your chances for a good outcome.

However, lap band surgery is a better option for some mentalities. It has a lower risk of serious complications, and for those who are not 100% sure that they’re ready to permanently change their body, it is the only established procedure that is completely reversible; it can be relatively easily converted into a more elaborate procedure at a later date.

Unfortunately, lap band surgery has a very high variability in weight loss from patient to patient, and is associated with more minor and annoying complications. Most concerningly, lap band surgery is much more likely to require reoperation over the long-term as a result of permanent failure.

The duodenal switch is probably the most effective procedure for the super-obese. It has been proven to be successful (result in at least 50% of excess weight loss) for about 85% of patients after 3 years.2

It may also be the most effective procedure for treating obesity-related health problems. For example, in one study duodenal switch surgery cured 100% of diabetic patients (Alverdy and Prachand, University of Chicago).

The amount of weight loss long-term also appears to be better than any other procedure, but it has the highest rate of serious complications and the most intensive bariatric vitamin adherence requirements due to the level of malabsorption.

Gastric sleeve surgery is less complicated than gastric bypass and duodenal switch and leads to similar weight loss.

While not reversible or easily adjustable like the lap band, it carries a much higher weight loss and much lower risk of reoperation.

Gastric sleeve surgery appears to be a bit safer than gastric bypass in terms of reoperation and complications, but gastric bypass seems to have a better effect on many obesity-related health problems.

During our Annual Weight Loss Surgery Cost Survey, when we speak directly with literally hundreds of surgical practices all over the world, we discovered that the majority of practicing surgeons are now recommending gastric sleeve surgery more often than any of the other more established procedures.

The intragastric balloon procedure appears to be a good "middle of the road" option: more aggressive than diet and exercise but less aggressive than traditional weight loss surgery. It is the first such procedure to receive broad acceptance by surgeons around the world.

If you are not comfortable taking the leap into a more permanent procedure and are mindful of its short-term nature, this may be an option to consider. Remember, if your habits revert back after the balloon is removed, your time, effort and money will be wasted. But if you are committed to a long-term change and are looking for something to "jump start" your efforts, the balloon provides that option.

Hear It Straight from the Source… For Free

Most surgeons offer free seminars that teach you about your options and their office’s specific results. The seminars also allow you to get to know the surgeon prior to a one-on-one consultation (usually free as well).

Click here to find and schedule a free in-person seminar or one-on-one consultation with a qualified weight loss surgeon in your area.


References for Types of Bariatric Surgery: Full Comparison

  1. Brigham and Women’s Hospital. Promising Results Reported
    from First Completed Transoral Gastric Volume Reduction Trial. October
    2008. Available at:
    Accessed: October 4, 2009.
  2. Prachand VN, et al. Duodenal Switch Provides Superior
    Weight Loss in the Super-Obese (BMI ≥50kg/m2) Compared With Gastric
    Bypass. Ann Surg. 2006 October; 244(4): 611–619.
  3. Fobi Mal, Lee H, Felahy B, et al. Choosing an operation for weight control and the transected banded gastric bypass. Obes Surg. 2005;15:114–121.
  4. Li, Jian-Fang MDSurgical Laparoscopy, Endoscopy & Percutaneous Techniques:
    February 2014 – Volume 24 – Issue 1 – p 1-11
    doi: 10.1097/SLE.0000000000000041

[ Last editorial review/modification of this page : 05/12/2016]

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