Preparation begins with a complete medical evaluation that includes blood tests, assessment of hemoglobin levels, and studies to verify the function of vital organs. The patient's nutritional status is evaluated, as vitamin and mineral deficiencies are common after massive weight loss, so supplements such as iron and vitamin C may be indicated. It is essential to stop smoking before surgery, as smoking significantly delays healing. In addition, psychological support is recommended to manage expectations and maintain a positive attitude throughout the process.