Obesity Surgery

, Volume 18, Issue 2, pp 145–150 | Cite as

Prevalence of Vitamin D Insufficiency and Deficiency in Morbidly Obese Patients: A Comparison with Non-Obese Controls

  • Whitney S. Goldner
  • Julie A. Stoner
  • Jon Thompson
  • Karen Taylor
  • Luann Larson
  • Judi Erickson
  • Corrigan McBride
Research Article

Abstract

Background

Vitamin D deficiency is common in patients after bariatric surgery. However, obesity itself has also been associated with decreased vitamin D. The prevalence of vitamin D deficiency in obese persons has not previously been compared to non-obese controls when controlling for factors that could affect vitamin D status.

Methods

We evaluated 25 hydroxy vitamin D, iPTH, calcium, albumin, and creatinine in 41 patients undergoing Roux-en-Y gastric bypass. We then compared them to healthy non-obese controls matched for age, sex, race/ethnicity, and season of vitamin D measurement.

Results

Ninety percent of the pre-bariatric surgery patients had 25-OH-D levels <75 nmol/l, and 61% had 25-OH-D levels <50 nmol/l versus 32 and 12% in controls, respectively. Additionally, 49% of the pre-bariatric surgery patients had secondary hyperparathyroidism versus 2% of controls. These differences persisted after controlling for sunlight exposure and dietary intake of calcium and vitamin D. Mean calcium, corrected for albumin, and creatinine were not significantly different between the groups, but mean albumin levels were significantly lower among surgery patients.

Conclusion

Vitamin D deficiency is common in obese patients at the time of bariatric surgery and is also accompanied by secondary hyperparathyroidism approximately half the time. These findings suggest that vitamin D deficiency after bariatric surgery is multifactorial and in part caused by preoperative vitamin D deficiency rather than postoperative malabsorption alone. In this study, increased vitamin D deficiency in obese persons cannot be explained by a difference in calcium/vitamin D intake or sunlight exposure.

Keywords

Vitamin D deficiency Vitamin D insufficiency Obesity Bariatric surgery Secondary hyperparathyroidism 

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Copyright information

© Springer Science + Business Media B.V. 2007

Authors and Affiliations

  • Whitney S. Goldner
    • 1
  • Julie A. Stoner
    • 2
  • Jon Thompson
    • 3
  • Karen Taylor
    • 3
  • Luann Larson
    • 4
  • Judi Erickson
    • 1
  • Corrigan McBride
    • 3
  1. 1.Department of Internal Medicine, Section of Diabetes, Endocrinology, and MetabolismUniversity of Nebraska Medical CenterOmahaUSA
  2. 2.Department of Biostatistics, College of Public HealthUniversity of Nebraska Medical CenterOmahaUSA
  3. 3.Department of SurgeryUniversity of Nebraska Medical CenterOmahaUSA
  4. 4.Department of Internal Medicine, Clinical Research CenterUniversity of Nebraska Medical CenterOmahaUSA

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