changes in serum level of vitamin d four years after sleeve gastrectomy in patients with morbid obesity: a single-center study

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.