There are several things to consider when trying to decide between gastric bypass surgery and gastric sleeve surgery. Unlike the laparoscopic adjustable gastric band (Lap Band), these two operations are both permanent, reduce hunger, and lead to the highest percentage of weight loss. To properly compare gastric sleeve surgery to gastric bypass surgery we will examine the following data :

  • Expected weight loss.
  • Speed of weight loss.
  • Time of surgery.
  • Gastric bypass benefits over sleeve.
  • Gastric sleeve benefits over bypass.
  • Risk of complications.
  • Surgeon skill and preference.



It’s important to know how much weight you can expect to lose after surgery. It’s equally important to know that long-term weight loss is more dependent on your lifestyle than which procedure you choose. Healthy exercise and eating habits will lead to more weight loss than the averages below.

If you do not implement healthy lifestyle changes after gastric bypass or gastric sleeve surgery, you can and likely will gain the weight back.

Gastric bypass patients lose between 60 to 80 percent of excess body weight in the first year. Gastric sleeve patients lose between 50 to 70 percent of excess body weight in two years.


Weight loss for average person.For super obese individuals, a BMI over 45, gastric bypass is often recommended. Gastric bypass is preferred because it produces slightly more weight loss on average, and it creates ‘dumping syndrome.’

Super obese patients often have eating disorders and long standing love/hate relationships with food. Because gastric bypass creates ‘dumping syndrome’ the patient is negatively reinforced with nausea, sweating, and a general ‘ill’ feeling shortly after they eat sweets or large amounts of carbohydrates. This helps reduce binging and limits high-carbohydrate foods.

However, many surgeons are finding that gastric sleeve surgery is also very helpful with super obese patients.

Gastric sleeve surgery removes 70% of the stomach where the hunger hormone ghrelin is produced.

This quickly and effectively reduces hunger and leads to excellent results in the super obese and other classes of obesity.

In fact, gastric sleeve surgery was originally created as the first step in a multi-stage procedure for the super obese. Surgeons would create a sleeve and then finish the rest of the procedure (re-route intestines) after the patient had lost some weight. However, most patients lost enough weight from the first part of the procedure (the sleeve) that they didn’t need a second procedure.

Use this calculator to find out how much you will weigh after gastric sleeve surgery and gastric bypass surgery.

1. How much do you weigh? lbs.
2. How tall are you? feet
3. Are you male or female? Male Female


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