This study aims to evaluate the nutritional status of morbidly obese patients following gastric bypass surgery. Data from 76 patients aged 19-64, who will be monitored by a dietitian for at least six months, will be analyzed. Preoperative and postoperative biochemical parameters along with anthropometric measurements will assess.

Objective: This retrospective study aims to evaluate the nutritional status of morbidly obese patients in the first six months following sleeve gastrectomy.

Methods: The study is planned as a retrospective analysis. The data of 76 patients aged 19-64 years who underwent bariatric surgery and were monitored by a dietitian for at least six months will be included in the study. Preoperative and postoperative biochemical parameters and anthropometric measurements of the patients will be collected and analyzed.

Detailed Description: The study will assess the changes in nutritional status, including body weight, BMI, fasting blood glucose, HbA1c, Homa-IR, iron levels, vitamin D levels, and lipid profile (triglycerides, LDL, HDL) among morbidly obese patients in the first six months following sleeve gastrectomy. Preoperative and postoperative measurements will be compared to evaluate the impact of surgery on these parameters.

Conclusion: Results will be analyzed and interpreted after data collection is completed, and conclusions will be drawn accordingly.

Inclusion Criteria:

• Data of patients aged 19-64 years
• Data of patients with BMI ≥ 40 kg/m2 or BMI ≥ 35 kg/m2 and at least one comorbidity such as obesity-related hypertension, dyslipidemia, type 2 diabetes mellitus, and sleep apnea
• Data of patients who underwent sleeve gastrectomy
• Volunteering

Exclusion Criteria:

• Data of patients who were not deemed suitable for surgery by the physician and to whom a surgical technique different from sleeve gastrectomy was applied
• Data of patients who were not followed up by a dietitian for six months after surgery
• Data of patients with gastrointestinal inflammatory bowel disease
• Data of patients with psychiatric disorders diagnosed by a physician
• Data of patients with cancer, pregnant and lactating women, alcohol or drug addiction

Data from 76 patients aged 19-64 years who applied to the General Surgery Obesity and Metabolic Surgery clinic and were followed up for six months were included.

individual participant data (IPD) don't be available to other researchers