Obesity Surgery

, Volume 19, Issue 2, pp 173–179

Finding the Optimal Dose of Vitamin D Following Roux-en-Y Gastric Bypass: A Prospective, Randomized Pilot Clinical Trial

Authors

    • Section of Diabetes, Endocrinology, and Metabolism, Department of Internal MedicineUniversity of Nebraska Medical Center
  • Julie A. Stoner
    • Department of Biostatistics and Epidemiology, College of Public HealthUniversity of Oklahoma Health Sciences Center
  • Elizabeth Lyden
    • Department of Biostatistics, College of Public HealthUniversity of Nebraska Medical Center
  • Jon Thompson
    • Department of SurgeryUniversity of Nebraska Medical Center
  • Karen Taylor
    • Department of SurgeryUniversity of Nebraska Medical Center
  • Luann Larson
    • Clinical Research Center, Department of Internal MedicineUniversity of Nebraska Medical Center
  • Judi Erickson
    • Section of Diabetes, Endocrinology, and Metabolism, Department of Internal MedicineUniversity of Nebraska Medical Center
  • Corrigan McBride
    • Department of SurgeryUniversity of Nebraska Medical Center
Research Article

DOI: 10.1007/s11695-008-9680-y

Cite this article as:
Goldner, W.S., Stoner, J.A., Lyden, E. et al. OBES SURG (2009) 19: 173. doi:10.1007/s11695-008-9680-y

Abstract

Background

Vitamin D deficiency is common following bariatric surgery and is due to a combination of baseline deficiency and postoperative malabsorption. There are few prospective studies evaluating the appropriate dose of vitamin D to prevent and treat vitamin D deficiency following bariatric surgery.

Methods

We evaluated three doses of vitamin D3 (800, 2,000, and 5,000 IU/day) in a prospective, randomized pilot trial of 45 patients undergoing Roux-en-Y gastric bypass. Serum 25 hydroxy Vitamin D (25OHD), intact PTH (iPTH), calcium, and urine calcium/creatinine ratios were measured at 6, 12, and 24 months postoperatively. Due to a high dropout rate at 24 months, we focus on the 12-month data.

Results

At 12 months, the 800-, 2,000-, and 5,000-IU groups had a mean ± SD increase in 25OHD of 27.5 ± 40.0, 60.2 ± 37.4, and 66.1 ± 42.2 nmol/L, respectively (p = 0.09) with a maximum increase in each group of 87.4, 114.8, and 129.8 nmol/L. Forty-four percent, 78%, and 70% achieved 25OHD levels ≥75 nmol/L (p = 0.38). Results for the 6- and 24-month time points were similar to the 12-month results. Mean weight loss at 24 months of the study was not different among groups (p = 0.52). Serum calcium did not change significantly, and there were no cases of hypercalcemia or sustained hypercalciuria.

Conclusions

Higher doses of vitamin D supplementation trend towards higher levels of 25OHD. Vitamin D replacement as high as 5,000 IU /day is safe and necessary in many patients to treat vitamin D deficiency following Roux-en-Y gastric bypass yet is still suboptimal in others.

Keywords

Vitamin D deficiencyBariatric surgeryObesityVitamin D supplementationTreatment

Copyright information

© Springer Science + Business Media, LLC 2008