Hypovitaminosis D in bariatric surgery: A systematic review of observational studies

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• 作者：Marlene Toufic Chakhtoura^a ; ^b ; ^{mc39@aub.edu.lb" class="auth_mail" title="E-mail the corresponding author} ; Nancy N. Nakhoul^b ; ^c ; Khaled Shawwa^b ; Christos Mantzoros^d ; Ghada A. El Hajj Fuleihan^a
• 关键词：25(OH)D ; 25-hydroxyvitamin D ; AACE ; American Association of Clinical Endocrinologists ; AGB ; Adjustable gastric banding ; BMI ; body mass index ; BPD ; biliopancreatic diversion ; GBP ; Gastric Bypass ; LAGB ; laparoscopic adjustable gastric banding ; LSG ; laparoscopic sleeve gastrectomy ; QCT ; quantitative computed tomography ; RYGB ; Roux-en-Y gastric bypass ; SG ; Sleeve Gastrectomy ; vBMD ; volumetric bone mineral density
• 刊名：Metabolism
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：65
• 期：4
• 页码：574-585
• 全文大小：991 K

文摘

Obesity is a public health problem that carries global and substantial social and economic burden. Relative to non-surgical interventions, bariatric surgery has the most substantial and lasting impact on weight loss. However, it leads to a number of nutritional deficiencies requiring long term supplementation.

Objectives

The aims of this paper are to review 25-hydroxyvitamin D [25(OH)D] status pre and post bariatric surgery, describe the dose response of vitamin D supplementation, and assess the effect of the surgical procedure on 25(OH)D level following supplementation.

Methods

We searched Medline, PubMed, the Cochrane Library and EMBASE, for relevant observational studies published in English, from 2000 to April 2015. The identified references were reviewed, in duplicate and independently, by two reviewers.

Results

We identified 51 eligible observational studies assessing 25(OH)D status pre and/or post bariatric surgery. Mean pre-surgery 25(OH)D level was below 30 ng/ml in 29 studies, and 17 of these studies showed mean 25(OH)D levels ≤ 20 ng/ml. Mean 25(OH)D levels remained below 30 ng/ml following bariatric surgery, despite various vitamin D replacement regimens, with only few exceptions. The increase in post-operative 25(OH)D levels tended to parallel increments in vitamin D supplementation dose but varied widely across studies. An increase in 25(OH)D level by 9–13 ng/ml was achieved when vitamin D deficiency was corrected using vitamin D replacement doses of 1100–7100 IU/day, in addition to the usual maintenance equivalent daily dose of 400–2000 IU (total equivalent daily dose 1500–9100 IU). There was no difference in mean 25(OH)D level following supplementation between malabsorptive/combination procedures and restrictive procedures.

Conclusion

Hypovitaminosisis D persists in obese patients undergoing bariatric surgery, despite various vitamin D supplementation regimens. Further research is needed to determine the optimal vitamin D dose to reach desirable 25(OH)D levels in this population, and to demonstrate whether this dose varies according to the surgical procedure.