Abstract
Background
High rates of vitamin D insufficiency are usually found in obese patients, even before any malabsorptive bariatric surgery. It is not clear whether they lack vitamin D because of different food intake, different solar exposure, or different storage pathways or bioavailability in adipose tissue. To better understand vitamin D deficiency, we studied different categories of inpatients.
Methods
We collected clinical and biological data from 457 consecutive inpatients during a year: 217 nonobese diabetic patients, 159 obese nonsurgical diabetic patients, 46 obese surgical nondiabetic patients, and 35 obese surgical diabetic patients. Statistically significant differences between two mean 25-hydroxyvitamin D (25(OH)D) levels were defined at the 5 % level using a Z-test.
Results
Vitamin D deficiency was found in 69 % of the patients, while 24 % had a normal level and 7 % an optimal level. A significant difference was found between obese (25(OH)D = 40.3 nmol/l) and nonobese patients (25(OH)D = 46.8 nmol/l). Patients undergoing bariatric surgery were not different from the other obese patients.
Conclusion
No significant difference in 25(OH) vitamin D level could be demonstrated between obese patients before bariatric surgery and obese patients with no obesity surgery project. No difference was found between our Parisian obese population and a Spanish obese population, which benefits from a better solar exposure. Both findings suggest that obesity itself is the link with vitamin D deficiency, independently from behavioral differences.
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This research did not receive any specific grant from any funding agency in the public, commercial, or not-for-profit sector.
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All the authors declare that there is no actual or potential conflict of interest including any financial, personal, or other relationships with other people or organizations that could inappropriately influence, or be perceived to influence, their work.
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Ducloux, R., Janin, C., Ducloux, H. et al. High Vitamin D Deficiency Rate in Metabolic Inpatients: Is Bariatric Surgery Planning Found Guilty?. OBES SURG 24, 1947–1953 (2014). https://doi.org/10.1007/s11695-014-1274-2
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DOI: https://doi.org/10.1007/s11695-014-1274-2