The gastric bypass operation consists of cutting out the so-called pouch from the stomach, which is a small reservoir (mini stomach) with a volume of several dozen millilitres, and then connecting this reservoir with the cut intestine by means of an anastomosis in such a way as to reduce the length of the intestine actively digesting and absorbing the ingested food.

During gastric bypass surgery, a second anastomosis is still performed between the loops of small intestine. From a technical and practical point of view, the patient after the operation has 3 different loops of intestine within the small intestine - the alimentary, the enzymatic and the common one, where the digestion of food takes place.

The new hormonal activity of the gastrointestinal tract as a result of the anatomical changes is also of no small importance for the patient. This is extremely important in view of the therapeutic impact of the bypass on type 2 diabetes.

Gastric bypass - graphics before and after gastric reduction surgery

Procedure path

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Bariatric consultation with the surgeon

If you are considering surgical treatment of obesity, make an appointment with our surgeon. During the first appointment the physician will assess the degree of obesity, take medical history of co-morbidities and obesity complications.


You will receive information on possible treatment options and be pre-qualified for the selected surgery. You will also receive a diagnostics plan preparing you for the surgery.


We want to gather as much information as possible about your health condition so that further treatment is as safe and personalized as possible. We schedule a diagnostic appointment and a planned surgery date.

Diagnostics and preparation

We offer our patients a full diagnostic package which includes all necessary tests and specialist consultations required to perform the surgery. Typical diagnostic scheme:

  • nutritionist consultation,
  • psychologist consultation
  • cardiologist consultation (with echocardiography examination)
  • pulmonologist consultation (with spirometry examination)
  • endocrinologist consultation
  • gastroenterologist consultation with gastroscopic examination performed under general anaesthesia
  • abdominal ultrasound
  • chest x-ray
  • comprehensive blood chemistry panel


The diagnostics is coordinated by an experienced specialist and your attending surgeon.


We begin treatment prior to the surgery, in the diagnostic phase. The nutritionist prepares a nutrition plan, which will help you prepare for the post-surgery changes, achieve initial weight loss and reduce liver steatosis. This specialist also provides you with nutrition education including the principles of proper nutrition to be followed before and after surgery. Simultaneously, the psychologist will equip you with the psychological means of coping with the transformation that awaits you.

Preoperative period (approx. 30 days)

You follow a nutrition plan. The attending physician, nutritionist and psychologist stay in permanent touch with you, providing you with support and advice.

Hospitalization and surgery

You will be admitted to the Surgical Ward after a period of a few weeks following the completion of diagnostics. The patients usually stay in our hospital for 4 days:

  • Day 1. Hospital admission, preparation of necessary documentation. Performing the most-recent blood chemistry tests. Discussing and signing the consent for surgery with the surgeon.  Anaesthesiologist consultation.
  • Day 2. The surgery is performed between 8:30 and 15:00, depending on the surgery plan. After surgery, the patient spends the rest of the day and night in the recovery room under the care of skilled medical and nursing staff. You will start drinking small amounts of water on your surgery day.
  • Day 3. The beginning of convalescence. We will assess your health condition and convalescence progress based on surgeon’s assessment and blood chemistry tests. Another nutritionist consultation during which you will receive recommendations for the recovery period (4-6 weeks).
  • Day 4. We will assess your health condition and convalescence progress once again based on surgeon’s assessment and blood chemistry tests. Oral diet inclusion. Discharge.


After the end of the surgical treatment we stay in permanent touch with our patients via phone or e-mail. In addition to this, we will also meet on the follow-up appointments.


  • The first appointment will be scheduled one month after the surgery: convalescence and initial weight loss assessment. Review of follow-up laboratory tests, i.a. vitamin level, blood morphology and other blood chemistry tests.
  • The follow-up nutritionist consultation is also scheduled approximately one month after the surgery (most often also with the surgeon consultation).
  • We will meet approximately every 3 months in the first year. During the follow-up appointments we will monitor your health condition and ensure you make a safe recovery.

Gastric bypass Wrocław - Baria3

Gastric Bypass - Benefits

  • 1

    70-80% reduction in excess body weight

    Your body weight will be significantly reduced within the first 6 to 12 months.
  • 2

    A quicker feeling of fullness.

    You will feel satisfied after eating much smaller meals than before the surgery. A smaller stomach means that you’ll feel fuller on just one, small plate.
  • 3

    Better control over type 2 diabetes.

    A change in hormone activity in the gastrointestinal tract and sensitizing peripheral tissues to insulin leads to better control over type 2 diabetes or even curing it completely.

Who is it for?



The surgery yields very good outcomes and has the longest track record of all the bariatric procedures. That is the reason why it is the most effective and the best weapon in the fight against obesity.

It is especially recommended for patients with type 2 diabetes, due to its effect on hormone activity in the gastrointestinal tract and sensitizing peripheral tissues to insulin. After the surgery many patients have been successfully cured of this most dangerous consequence of obesity.

The specific shape of the new mini stomach introduced as a result of gastric bypass surgery, almost always treats gastroesophageal reflux, and certainly reduces the intensity of acid reflux.

In obese patients diagnosed with a diaphragmatic hiatal hernia, which often results in gastroesophageal reflux and heartburn, the hernia repair surgery should be performed along with gastric bypass surgery, which allows for curing the patient of two diseases – gastroesophageal reflux and obesity.

Thanks to the gastric bypass surgery the patients who prefer to eat sugary foods for every meal, will not absorb all the sugars they take in, and in some cases, they may not tolerate them well, which will effectively discourage them from eating sweets.


Active nicotinism, is definitely an unfavourable factor for any bariatric surgery. However, smoking carries an additional risk for those undergoing a gastric bypass surgery. Smokers are at the highest risk of developing ulceration of gastrointestinal anastomosis sometime after the gastric bypass surgery.

Due to the fact that, the surgeon is forced to operate in both the upper and lower abdominal regions during the gastric bypass surgery, a large number of intestinal adhesions, which are a common consequence of the lower abdominal surgery, certainly creates added difficulty at the time of surgery.

In patients with inflammatory bowel disease such as Crohn's disease, sleeve gastrectomy is the preferred method of operation, because it is does not use the intestine.

In young women planning to become pregnant in the future, gastric bypass surgery may be associated with an increased risk of foetal and maternal exposure to deficiencies in macronutrients and micronutrients during pregnancy.

Temporary contraindications to any bariatric surgery include active alcoholism, drug addiction, and mental illness outside remission period.

Pregnancy is also a period when we should be more concerned about the proper development of the foetus rather than weight gain.

Our approach to obesity treatment is as follows: the patients who ignore the nutritionist’s and psychologist’s recommendations or consider them irrelevant are not ready for the surgery.

Start your journey



Patient feedback

I underwent gastric bypass surgery

Since childhood, my weight easily increased and only went down with draconian diets. The lowest was around 80kg as I can't remember ever weighing 60kg (at my height of 160cm). The frustrations of the constant struggle made me finally decide to change that once and for all. Your mental state is one thing when you can't look yourself in the mirror your whole life – even at the gym – but the medical aspect is probably worse as I have struggled with hypertension and insulin resistance for many years. Today marks 5 years since my operation. Once again, I would like to thank you very much for giving me the chance.

My weight has “dropped” from 101kg to 63kg and is still stable. Thanks to the whole team, activity, healthy choices, lots of colours and smiles have all returned to my life.

Gastric bypass - price and offer

Price List

Our consultant will contact you within 24 hours to schedule an appointment and provide you with further details.

We take responsibility for our patients: in case our patient needs to be readmitted to the hospital and undergo an additional surgical procedure during the recovery period, the services will be provided at no additional charge to the patient.


    PLN 300

    PLN 3 950
    in-depth diagnostics in preparation for surgery, including consultation with a dietician and psychologist

    PLN 22 900
    with hospital stay
  • Package: diagnostics + gastric bypass surgery

    PLN 26 150
    comprehensive examinations, care of a dietitian, psychologist and surgeon, operation with hospital stay



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Bmi calculator


The BMI (Body Mass Index) calculator is a quick and convenient method to calculate your own body mass index. This index is used to determine the severity of obesity as well as to assess the risk of developing diseases associated with excessive body weight. The higher the degree of obesity, the higher the risk of obesity complications is, unfortunately.

Your BMI

Your BMI: 420
III stopień otyłości


  • below 18,5
  • 18,5 - 24,9
    correct body weight
  • 25 - 29,9
  • 30 - 34,9
    1st degree obesity
  • 35 - 39,9
    2nd degree obesity
  • 40 above
    3rd degree obesity
Michał Krefft -
Rafał Mulek -




Collegium Medicum UMK w Bydgoszczy Uniwersytet SWPS w Warszawie