Abstract
Background: Bariatric procedures are associated with various micronutrient and vitamin deficiencies, including vitamin D. Objectives: The aim of the study was to assess the effect of laparoscopic sleeve gastrectomy (LSG) on serum vitamin D levels in a 4-year follow-up of obese patients. Methods: All obese patients undergoing LSG at Modarres Hospital were included in this study. Patients were evaluated 4 years after surgery, and their serum levels of calcium, parathyroid hormone (PTH), and vitamin D were measured. Results: Analytical analysis demonstrated a statistically significant difference in vitamin D and calcium levels before and after LSG (P-value < 0.001 for both). However, the change in PTH levels before and after LSG was not statistically significant. Additionally, the analysis showed no statistically significant relationship between vitamin D levels and PTH levels. Conclusions: The results of the present study showed that, four years after LSG, vitamin D and calcium levels significantly increased in patients with morbid obesity, although the observed increase in PTH levels was not statistically significant.
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