gastric bypass vs sleeve

Gastric bypass vs sleeve gastrectomy | A comparison

Gastric bypass and laparoscopic sleeve gastrectomy both are permanent surgical techniques for weight loss. Hence, let’s assess gastric bypass vs sleeve through several parameters.

The difference in weight loss among gastric bypass and sleeve 

Gastric bypass treats severely obese people. Moreover, obese patients lose nearly 60-80% of the additional body mass in the first year. In gastric sleeve, patients lose 50-70% of the body mass in two years. Conversely, patients lose about 50% of excess mass after laparoscopic sleeve gastrectomy.

Surgery Duration

According to ‘A Review of laparoscopic sleeve gastrectomy for Morbid Obesity,” the duration of surgery for gastric bypass is 164.8 minutes on average. However, the average time duration for the gastric sleeve technique is 100.4 minutes.

Weight loss concerning the time 

When we consider Gastric bypass vs sleeve for immediate results, the gastric bypass technique reduces weight much greater than the sleeve technique in two years. For long-term weight loss, sleeve gastrectomy is more effective. Time duration of weight loss is also dependent on diet and physical activity.

Typical advantages of Both Techniques

Both the procedures share some advantages which are as follows:

  • Extremely safe.
  • Practical and profound results.

Benefits of Gastric Bypass over Sleeve

Despite the common advantages, there are some benefits that gastric bypass offers.

  • It is studied and researched more with proven effective results.
  • Shortening the intestines results in less absorption of food reducing calorie consumption.
  • It develops a dumping syndrome which is beneficial.
  • Safe for acid reflux patients.

Advantages of Sleeve over bypass

  • Significantly reduces hunger due to reduced ghrelin production.
  • Surgery time is shorter.
  • The surgical procedure is easier.
  • Slow weight loss.

Complications: Gastric bypass vs sleeve

Just like any other surgery procedure, gastric bypass and sleeve gastrectomy also imply some complications. However, these complications can be easily avoided by choosing the best bariatric surgeon in Pakistan. Furthermore, patients undergoing gastric bypass surgery may experience the following

  • Nausea
  • Dehydration
  • Indigestion
  • Hypoglycemia
  • Vitamin deficiencies
  • Gall stones
  • Infection
  • Stomach ulcers
  • Venous thromboembolism
  • Hernia and haemorrhage.


Further complications associated with Gastric sleeve include

  • Nutritional deficiencies
  • Chronic and acute strictures
  • Gall stones
  • Staple line failure
  • Venous thromboembolism
  • Gastroesophageal reflux disease

Judgement and approval of your surgeon

Your medical advisor or surgeon would review your medical condition to opt between Gastric bypass vs sleeve. Hence, depending upon the situation, your surgeon, through unique insight, will help you to opt for the best-suited technique. For example, if you suffer from emotional eating, gastric bypass would be recommended. Your surgeon has experience in multiple cases and is well aware of the different needs of the patient. Therefore, it is the best practice to take the final verdict from your physician.