Gastric bypass surgery: Who is it for?

Learn about the criteria you must meet to have this weight-loss surgery.

By Mayo Clinic Staff

Gastric bypass surgery is the most common type of weight-loss surgery. Gastric bypass and other types of weight-loss surgery, collectively known as bariatric surgery, make surgical changes to your stomach and digestive system that limit how much food you can eat and how many nutrients you absorb, leading to weight loss.

While that may sound appealing, gastric bypass surgery isn't for everyone. Like any major procedure, it has significant health risks and side effects. In addition, the long-term success of gastric bypass surgery depends on your ability to make permanent changes in your lifestyle. When you want to be considered for gastric bypass surgery, you must undergo a thorough evaluation to determine if it's suitable for your situation.

Guidelines to qualify for gastric bypass surgery

Gastric bypass and other weight-loss surgeries are major, life-changing procedures. While weight-loss surgery can help reduce your risk of weight-related health problems — such as type 2 diabetes, high blood pressure, heart disease and sleep apnea — it can also pose major risks and complications. You may need to meet certain medical guidelines to qualify for weight-loss surgery. You likely will have an extensive screening process to see if you qualify.

In general, gastric bypass or another weight-loss surgery could be an option for you if:

  • Efforts to lose weight with diet and exercise have been unsuccessful
  • Your body mass index (BMI) is 40 or higher
  • Your BMI is 35 or more and you have a serious weight-related health problem, such as type 2 diabetes, high blood pressure or severe sleep apnea
  • You're a teenager who's gone through puberty, your BMI is 35 or more, and you have serious obesity-related health problems, such as type 2 diabetes or severe sleep apnea

In some cases, you may qualify for certain types of weight-loss surgery if your BMI is 30 to 34 and you have serious weight-related health problems.

Evaluating if you're ready for gastric bypass surgery

Even if you meet these general guidelines, you still may need to meet certain other medical guidelines to qualify for weight-loss surgery. You likely will have an extensive screening process to see if you qualify.

A team of health professionals — usually including a doctor, dietitian, psychologist and surgeon — evaluate whether gastric bypass or one of the other forms of weight-loss surgery is appropriate for you. This evaluation generally determines if the health benefits of the surgery outweigh the potentially serious risks, and if you're medically ready to undergo the procedure.

The evaluation also determines if you're psychologically ready to undergo weight-loss surgery. The procedure may increase certain risks in people with existing mental health conditions that aren't effectively managed.

For example, recent studies have identified an increased risk of suicide in people who have had weight-loss surgery. This risk is greatest in those who have attempted suicide in the past. More research is needed to understand whether changes related to the surgery itself play a role in increasing suicide risk.

A history of suicidal thoughts or attempts does not necessarily mean bariatric surgery isn't right for you, but your health care team should carefully evaluate your history and plan for close monitoring and support before and after the surgery.

When conducting an evaluation for gastric bypass surgery, the health care team considers:

  • Your nutrition and weight history. The team reviews your weight trends, diet attempts, eating habits, exercise regimen, stress level, time constraints, motivation and other factors.
  • Your medical condition. Some health problems increase the risks associated with having surgery or may be worsened by surgery, such as blood clots, liver disease, heart problems, kidney stones and nutritional deficiencies. The team evaluates what medications you take, how much alcohol you drink and whether you smoke. You will be evaluated for sleep apnea and receive a thorough physical exam and laboratory testing. The results of these tests and exams may help determine eligibility for weight-loss surgery.
  • Your psychological status. Certain mental health conditions may contribute to obesity or make it more difficult for you to maintain the health benefits of gastric bypass surgery. These may include binge-eating disorder, substance abuse, anxiety disorders, major depression, schizophrenia, severe bipolar disorder and issues related to childhood sexual abuse.

    While these conditions may not prevent you from having gastric bypass surgery, your doctors may want to postpone surgery to ensure that any condition or significant sources of stress are appropriately treated and managed.

  • Your motivation. The team will also assess your willingness and ability to follow through with recommendations made by your health care team and to carry out prescribed changes in your diet and exercise routine.
  • Your age. There's no specific age limit for gastric bypass surgery, but, until recently, the procedure was considered too risky for teenagers and older adults. Newer studies have found gastric bypass surgery can be safe and effective for adults ages 60 and older. The procedure is also now considered an option for some teenagers with a BMI of 35 or more and serious obesity-related health problems.
Sept. 16, 2017 See more In-depth