Bariatric surgery

Obesity is one of the most significant problems for human health and the quality of life of people who suffer from it

Bariatric surgery cirugia-bariatrica


Unfortunately, the number of obese people in our country is increasingly alarming and the percentage of obese people continues to grow. Close to 40% of adults areis overweight and 15% of children are obese. In other countries of the world, this percentage is higher.

However, obesity is not just an aesthetic problem: it is associated with a number of illnesses, such as diabetes and sleep apnea, as well as cardiovascular diseases such as hypertension, heart attack, cerebral hemorrhages and deep vein thrombosis. According to a recent publication in the United States, obese individuals have a higher chance of developing cancer.

For these reasons, there is an urgent need to open centres that specialise in the treatment of these patients.

At Instituto Pérez de la Romana we have created the Obesity Unit, where we address the problem of obesity in an integrated manner, which is the most modern and correct approach. To do this, we work with a number of different types of specialists (endocrinologists, gastroenterologists, psychologists, physiotherapists, bariatric surgeons and plastic surgeons). Using this approach, irrespective of the extent of their obesity (whether minimal, intermediate or morbid), patients will be able to receive suitable, controlled treatment at all times from specialists highly qualified in the treatment of these patients to obtain optimal results.



Aimed at individuals who wish to lose 5-10 kilos. This approach consists of studying eating habits and providing advice on the most suitable low-calorie diets in each case and recommending physical exercise specifically for each person. It also consists of helping them more easily adopt various diets and to change certain lifestyle habits so that they can achieve their weight loss in a comfortable and stable manner. This type of treatment is developed by the endocrinologist, the psychologist and the physiotherapist.


Aimed at people who want to lose up to 10-15 kilos (about 10% of their body weight) . A type of limited bariatric surgery, called the sleeve technique, is required. This technique consists of inserting a tube in the stomach and is a short operation that produces a good and stable result.


Aimed at individuals who need to lose more than 30-40 kilos (more than 30% of their body weight). This group of patients is the group in which the greatest changes due to weight loss and change in appearance were observed. To achieve this outcome,a stomach reduction and an intestinal bypass are required.

These procedures are known as bariatric surgery and are directed by Dr. Aniceto Baltasar, a pioneer of bariatric surgery in Spain.

The physical changes seen in these patients are spectacular, as are the changes in their mood. The only thing left for these patients is to eliminate excess skin on the body: when a person loses a large amount of weight, skin accumulates on the chest, back, arms, abdomen and thighs. Eliminating this tissue leads to excellent results for the patient, whether they are dressed or not.


Only individuals who suffer from morbid obesity and who need to lose more than 30 to 40 kilos.

There are three types of procedure:


Stomach operations

Stomach operations consist in making the stomach smaller, and therefore, they are related to a reduction of food intake so that the patient has to eat less.


Intestine operations

Operations on the small intestine reduce the time required to absorb food. The small intestine is 4 to 11 meters long, and none of it is removed. What is changed is the route of the food consumed, so that it does less than half of its route only.


Mixed operations

Mixed operations are those that use the two above components. They reduce the size of the stomach and change the food transit in the intestine. These operations are those that can help patients lose the most weight.

This technique is the one we use most at the Instituto Pérez de la Romana.



Click on the buttons to see the before-and-after comparison.

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What is bariatric surgery?

It is surgery for very obese and morbidly obese patients that reduces their weight and eliminates diseases associated with obesity.

It consists of decreasing the size of the stomach and small intestine.

I have lost much weight, doctor. What to do with the skin I have left over?

Usually, a patient will lose between 60 and 100 kilos (sometimes more) after bariatric surgery and all patients usually have excess skin on the abdomen, thigh, chest and arms. To correct this we there is body remodeling surgery, which we perform at the Institute with great satisfaction for patients.

Is the procedure painful?

No, this surgery is not painful but a little uncomfortable as a result of the length of the scars it leaves. However, if the patient follows the instructions given them it is quite bearable.

Is there any risk associated with bariatric surgery?

It is very important surgery that must be performed in patients who are well-informed. Under these circumstances, with the patient under full control, there are no risks. Current procedures are less invasive and conducted using a laparoscope.

Doctor, I just need to lose five or six kilos. What treatment do you recommend?

For such minor weight loss, it is a question of studying the eating habits of the patient and advising them to adopt a low-calorie diet while at the same time recommending the best exercises for them, depending on their work and routine activities.

What is the minimum weight loss I would need to justify undergoing bariatric surgery?

More than the number of kilos, we recommend you consider your body mass index. But as a guide, I would say that bariatric surgery using the “sleeve ” or gastric sleeve technique – which is much simpler, has a shorter recovery time and produces a good and stable result – could be conducted for an intended weight loss of between 10 and 15 kilograms.

What should I do to lose more than 30 kilos?

Bariatric surgery is a must for people with a body mass index of more than 40 or who want to lose more than 30 kilos is obligatory, using the techniques performed by Dr. Baltasar at our institute.

How do I calculate my body mass index?

Divide your weight in kilograms by the square of your height in meters.

If I have a bariatric surgery. How long is the admission time?

After the procedure, you must stay in the clinic for one or two days so that we can monitor your progress, then at home for a week or so.



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