The mechanism of weight loss during Gastric Sleeve is based on various effects that this procedure entails. Although this mechanism varies from person to person, it can be said to be universal for every patient.


Sleeve gastrectomy is a procedure in which around 80% of the stomach is removed. The procedure is performed using laparoscopic surgery. This involves making 4-5 incisions of an average size of 1 cm in the patient’s stomach, through which the procedure is performed using special medical equipment.

The main aim of the operation is to enable rapid weight loss and to treat obesity. The operation has various mechanisms and effects that enable weight loss. Details of these mechanisms are listed below:


During the operation, around 80 per cent of the stomach is removed, leaving a very small section. This part resembles a tube, as it is shaped with the help of a sizing tube. The fact that its volume is quite small makes it much easier for patients to lose weight.

The main reason why obese patients cannot lose weight with diet and exercise is that they have difficulty sticking to their diet and exercise. In particular, they are unable to stick to their diets and continue to overeat. As a result, their eating habits deteriorate and weight loss does not take place.

Due to the shrinking of the stomach, patients now fill their stomach with much less food and achieve a feeling of fullness. In this way, they lose weight effectively.

One very important detail should not be forgotten. The stomach is an organ that can expand. Even if the shrunken stomach resulting from the operation makes the diet easier, patients should also show willpower here and stick to their diet, especially in the follow-up period.


There are various hormones and secretions that are secreted by the inner wall of the stomach. The hunger hormone is one of them and is of great importance. The hunger hormone ghrelin is released when the stomach empties and triggers a feeling of hunger.

When the stomach shrinks, the amount of the hunger hormone released decreases. This contributes to patients feeling significantly less hungry in the post-operative phase. Feeling less hungry means less food and fewer calories.

Another important aspect that can be described as a mechanism of weight loss during stomach reduction is the decrease in the hunger hormone.


After the operation, the amount of food the patient needs to eat to feel full is significantly reduced. Even with very small portions, patients achieve a feeling of fullness so that food intake is significantly reduced.

The feeling of fullness is achieved quickly and lasts longer. Whereas in the past patients felt hungry in very short periods of time and lost the feeling of fullness, this situation changes positively after the operation.


Motivation, even if the operation is not directly one of the mechanisms of weight loss, can be indirectly counted among the mechanisms it provides. This is because this operation significantly increases the patient’s belief that they will lose weight.

The decision to have the operation is one of the most important results of this motivation. Thanks to the decision and belief in weight loss, the effects of the surgical procedure are very great. With motivation, diet and exercise programmes also become more important. The above-mentioned effect of the surgery can also be counted as part of the weight loss mechanism.


When the stomach volume is greatly reduced, patients experience a significantly reduced appetite. One reason for this is that the stomach is filled with much smaller portions than before. The other reason is the decrease in the hunger hormone secreted by the stomach.

The decrease in appetite has a positive effect on the weight loss process and enables patients to lose weight much more effectively.


Weight loss after gastrectomy varies from patient to patient. The patient’s current weight, general health and adherence to the diet and exercise programme are important at this point.

Patients who adhere to diet and exercise lose 35-50kg in the first 6-8 months. For some patients, weight loss may be much higher or relatively lower. In general, however, patients lose most of their excess weight if they pay attention to diet and exercise after surgery.

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