Many patients believe that body weight is the main criterion for bariatric surgery. In reality, the modern approach is far more comprehensive. Physicians evaluate not only the number on the scale or the Body Mass Index (BMI), but also the patient's overall health, the presence of obesity-related diseases, the results of previous treatment, and the patient's readiness to make long-term lifestyle changes.

This evidence-based approach is described in the Ukrainian Ministry of Health Guideline "Bariatric Surgery (Surgical Treatment of Obesity)", which is based on the principles of evidence-based medicine.

Bariatric Surgery Is Not a "Last Resort"

One of the most common misconceptions is that bariatric surgery is performed only after a person has spent many years unsuccessfully trying to lose weight.

In fact, current clinical guidelines recognize bariatric surgery as an effective treatment for obesity that can reduce the risk of cardiovascular disease, improve type 2 diabetes control, resolve obstructive sleep apnea, and significantly enhance quality of life.

When Can a Patient Be Referred to a Bariatric Surgeon?

1. BMI of 40 kg/m² or Higher

This is the classic indication for bariatric surgery.

At this level of obesity, the risk of serious obesity-related complications significantly outweighs the potential risks associated with the surgical procedure.

2. BMI of 35–40 kg/m² Combined with Obesity-Related Conditions

This group of patients often experiences the greatest health benefits from bariatric surgery.

Referral may be appropriate in the presence of:

Type 2 diabetes mellitus;
Arterial hypertension requiring treatment;
Obstructive sleep apnea requiring CPAP therapy;
Severe musculoskeletal disorders that limit mobility.

In other words, the decision is based not only on body weight but also on how obesity affects overall health.

Why Do Physicians Ask About Previous Weight Loss Attempts?

According to the guideline, patients should undergo a structured conservative weight management program before surgical treatment is considered.

It is important to understand that patients are not expected to spend years unsuccessfully trying to lose weight.

Instead, physicians evaluate:

whether medical recommendations were followed;
whether at least partial weight loss was achieved;
whether the achieved weight loss was maintained.

If comprehensive obesity treatment fails to produce satisfactory results or weight is rapidly regained, bariatric surgery may become the most appropriate treatment option.

Age Is an Important but Not an Absolute Criterion

The guideline notes that most clinical studies included patients between approximately 20 and 60 years of age, with some studies including individuals up to 65 years old.

However, this does not automatically exclude older adults from surgical treatment.

Modern decision-making requires an individual assessment of:

functional status;
coexisting medical conditions;
anesthetic and surgical risks;
the expected benefits of surgery.

For example, an active 66-year-old patient may present a lower surgical risk than a 50-year-old individual with severe heart failure. This is why every case is evaluated individually.

Readiness for Lifestyle Changes Is One of the Most Important Criteria

Bariatric surgery is not a "mechanical" solution to obesity.

After surgery, patients are expected to:

adopt healthier eating habits;
attend regular follow-up appointments;
take recommended vitamin and mineral supplements;
follow physical activity recommendations.

For this reason, bariatric surgeons assess not only medical indicators but also the patient's motivation and willingness to commit to long-term follow-up and lifestyle changes.

Does Meeting the Criteria Guarantee Surgery?

No.

Meeting the referral criteria simply means that the patient should be evaluated by a bariatric surgeon.

Following a comprehensive assessment, the multidisciplinary team evaluates:

the risks of surgery;
the expected health benefits;
possible contraindications;
the most appropriate surgical procedure.

In some situations, medical therapy or continued conservative treatment may still be the preferred option.

Modern bariatric surgery is no longer considered a treatment only for people who "cannot lose weight." It is now recognized as an essential component of comprehensive obesity management based on evidence-based medicine and individualized patient care.

If your Body Mass Index (BMI) is 35 kg/m² or higher and obesity is already affecting your health, or if your BMI exceeds 40 kg/m², you should not decide on surgery independently. Consulting a bariatric surgeon is the best first step. Only after a comprehensive evaluation can specialists determine whether bariatric surgery is the safest and most effective treatment option for your individual situation.