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Parathyroid hormone, but not vitamin D, is associated with the metabolic syndrome in morbidly obese women and men: a cross-sectional study. Hjelmesaeth J, Hofsø D, Aasheim ET, Jenssen T, Moan J, Hager H, Røislien J, Bollerslev J. Cardiovasc Diabetol. 2009 Feb 3;8:7. PMID: 19187564 doi:10.1186/1475-2840-8-7 CONCLUSION: The PTH level, but not the vitamin D level, is an independent predictor of MS in treatment seeking morbidly obese Caucasian women and men. Randomized controlled clinical trials, including different therapeutic strategies to lower PTH, e.g. calcium/vitamin D supplementation and weight reduction, are necessary to explore any cause-and-effect relationship.

Vitamin D Deficiency in the Morbidly Obese. Buffington C, Walker B, Cowan GS Jr, Scruggs D. Obes Surg. 1993 Nov;3(4):421-424. PMID: 10757956 These data suggest that low vitamin D may be associated with obesity per se. Hypovitaminosis D, when it is found in post-bariatric surgery patients, may not be caused by the surgery since it may have been present to some degree pre-operatively.