It is a surgical operation in which approximately 75-80% of the stomach is removed. After the operation, the stomach shrinks significantly compared to its previous volume, thus causing less food intake.
Since the appetite hormone (Ghrelin) secreted from the stomach (fundus) part removed in this surgery decreases after the operation, the level of this hormone in the blood drops significantly.
Therefore, the feeling of hunger weakens and appetite decreases in patients. In the long term, there is no significant problem in the absorption of nutrients necessary for the body.