Vitamin D Status in Patients with Morbid Obesity Following Bariatric Surgery in Shiraz, Iran: A Retrospective Observational Study

Rajabi, Sadegh; Aghamohammadi, Vahideh; Moradpour, Gholamreza; Amini, Masoud; Hosseini, Seyed Vahid; Sobhani, Zahra; Medhati, Pourya; Hosseini, Elahe; Hosseini, Babak; Haghighat, Neda; Vafa, Leila; Moeinvaziri, Nader

doi:10.1089/bari.2020.0121

Cited by 2 publications

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“…Vitamin D status is essential for bone mineralization and muscle function, especially in patients with severe obesity who are at higher risk of deficiency before and after bariatric surgeries [ 41 ]. Vitamin D deficiency has been associated with increased risk of inflammatory diseases and also bone disease including rickets, osteomalacia, and osteoporosis [ 144 ]. According to the pooled estimates in the current meta-analysis, 59.44% of patients had vitamin D deficiency, and 26.95% had insufficiency.…”

Section: Discussionmentioning

confidence: 99%

A Systematic Review and Meta-Analysis of Vitamin D Status of Patients with Severe Obesity in Various Regions Worldwide

Haghighat,

Sohrabi,

Bagheri

et al. 2023

Obes Facts

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Introduction: Managing nutritional deficiencies is an essential component in the treatment of severe obesity. Vitamin D deficiency is often reported in investigations in severe obese cohorts. However, no prior study has summarized findings on this topic. Consequently, the aim of this systematic review and meta-analysis was to investigate the 25-hydroxyvitamin D [25(OH)D] status in individuals with severe obesity in different regions worldwide. We also evaluated levels of calcium, PTH, and magnesium as secondary outcome measures. Methods: We searched Medline, PubMed, Scopus, the Cochrane Library, and EMBASE for relevant observational studies published in English from 2009 to October 2021. The heterogeneity index among the studies was determined using the Cochran (Q) and I2 tests. Based on the heterogeneity results, the random-effect model was applied to estimate the prevalence of vitamin D deficiency. Results: We identified 109 eligible observational studies. Overall, 59.44% of patients had vitamin D deficiency [25(OH)D <20 ng/ml], whereas 26.95% had vitamin D insufficiency [25(OH)D 20-30 ng/ml]. Moreover, the mean 25(OH)D levels was 18.65 ng/ml in 96 studies. The pooled mean estimate of the serum calcium, PTH and magnesium was 9.26 mg/dl (95% CI: 9.19-9.32, I2=99.7%, p<0.001), 59.24 pg/ml (95% CI: 54.98, 63.51), I2= 99.7%, p < 0.001), and 0.91 mg/dl (0.84, 0.98, I2= 100.0%, p < 0.001), respectively. The results of the sub-group analysis indicated that the mean estimates of 25(OH)D was highest in North America [21.71 ng/ml (19.69, 23.74), (I2=97.2%, p<0.001)] and lowest in Southeast Asia [14.93 ng/ml (14.54, 15.33), (I2=0.0%, p = 0.778)]. Conclusion: The results obtained showed a significant prevalence of vitamin D deficiency among severely obese individuals in various geographical regions, whereas the highest and lowest mean estimates were reported for North America and Southeast Asia, respectively.

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Section: Discussionmentioning

confidence: 99%

A Systematic Review and Meta-Analysis of Vitamin D Status of Patients with Severe Obesity in Various Regions Worldwide

Haghighat,

Sohrabi,

Bagheri

et al. 2023

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“…To ensure that the general population and women of childbearing age consume enough vitamin D, many countries have fortified some foods with vitamin D ( 9 ). However, limited foods have been fortified with vitamin D in Iran ( 10 ).…”

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confidence: 99%

Validity and reliability of a semi-quantitative food frequency questionnaire for assessing dietary vitamin D and calcium intakes in Iranian childbearing age women

et al. 2022

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This study aimed to examine the validity and reliability of a semi-quantitative food frequency questionnaire (FFQ) designed to estimate dietary vitamin D and Calcium (Ca) intakes in a sample of Iranian childbearing age women. An 87-item FFQ was developed and 84 healthy childbearing age women completed it. FFQ was validated by comparing its results with the 24-h dietary recall (24-h recall) and serum 25-hydroxyvitamin D (S-25(OH)D) as the references methods. The FFQ was completed for the second time after 4 weeks to assess the reliability of the questionnaire. Data were analyzed using spearman’s correlation, cross-classification analysis, Bland–Altman plots, the weighted κ, intraclass classification, and the method of triads. Spearman’s correlations between vitamin D and Ca intakes by the FFQ and 24-h recalls and between vitamin D intakes and S-25(OH)D were significant (r: 0.706, r: 0.959, and r: 0.682, respectively, all, P < 0.001). Cross-classification for vitamin D and Ca between two dietary methods and for vitamin D intake of FFQ and S-25(OH)D demonstrated that most of the quartiles were categorized into the same or adjacent quartiles. The Bland Altman plots for these nutrients also demonstrated good agreement. For vitamin D, the validity coefficients (VCs) calculated by the method of the triad for three methods were in the range of 0.808–0.843. The weighted κ for agreement of vitamin D and Ca by FFQ1 and FFQ2 were 0.18 and 0.638, respectively. The findings indicated that the developed FFQ has acceptable validity for estimating vitamin D and Ca. Its reliability for Ca was stronger than vitamin D.

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Vitamin D Status in Patients with Morbid Obesity Following Bariatric Surgery in Shiraz, Iran: A Retrospective Observational Study

Cited by 2 publications

References 26 publications

A Systematic Review and Meta-Analysis of Vitamin D Status of Patients with Severe Obesity in Various Regions Worldwide

A Systematic Review and Meta-Analysis of Vitamin D Status of Patients with Severe Obesity in Various Regions Worldwide

Validity and reliability of a semi-quantitative food frequency questionnaire for assessing dietary vitamin D and calcium intakes in Iranian childbearing age women

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