scholarly journals Oral vitamin D supplementation has a lower bioavailability and reduces hypersecretion of parathyroid hormone and insulin resistance in obese Chinese males

2014 ◽  
Vol 18 (12) ◽  
pp. 2211-2219 ◽  
Author(s):  
Ji-Chang Zhou ◽  
Yu-Mei Zhu ◽  
Zheng Chen ◽  
Jun-Luan Mo ◽  
Feng-Zhu Xie ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Vitamin D ◽  
Parathyroid Hormone ◽  
Vitamin D Supplementation ◽  
Normal Weight ◽  
Vitamin D Status ◽  
Intervention Trial ◽  
Oral Vitamin ◽  
Hydroxyvitamin D ◽  
25 Hydroxyvitamin D

AbstractObjectiveTo examine the vitamin D status, SNP of the vitamin D receptor gene (VDR) and the effects of vitamin D supplementation on parathyroid hormone and insulin secretion in adult males with obesity or normal weight in a subtropical Chinese city.DesignAn intervention trial.SettingShenzhen City, Guangdong Province, China.SubjectsFrom a cross-sectional survey conducted from June to July, eighty-two normal-weight and ninety-nine obese males (18–69 years) were screened to analyse their vitamin D status and for five SNP of VDR. From these individuals, in the same season of a different year, obese and normal-weight male volunteers (twenty-one per group) were included for an intervention trial with oral vitamin D supplementation at 1250 µg/week for 8 weeks.ResultsFor the survey, there was no significant difference (P>0·05) in baseline circulating 25-hydroxyvitamin D concentrations or in the percentages of participants in different categories of vitamin D status between the two groups. The VDR SNP, rs3782905, was significantly associated with obesity (P=0·043), but none of the examined SNP were correlated with serum 25-hydroxyvitamin D when adjusted for age, BMI and study group. After vitamin D supplementation, serum 25-hydroxyvitamin D concentration, hypersecretions of parathyroid hormone and insulin, and insulin resistance in the obese were changed beneficially (P<0·05); however, the increase in serum 25-hydroxyvitamin D was less than that of the normal-weight men.ConclusionsFor obese and normal-weight men of subtropical China, the summer baseline vitamin D status was similar. However, oral vitamin D supplementation revealed a decreased bioavailability of vitamin D in obese men and ameliorated their hypersecretion of parathyroid hormone and insulin resistance.

Vitamin D status in infancy and cardiometabolic health in adolescence

2020 ◽  
Vol 113 (1) ◽  
pp. 104-112
Author(s):  
Joshua Garfein ◽  
Kerry S Flannagan ◽  
Sheila Gahagan ◽  
Raquel Burrows ◽  
Betsy Lozoff ◽  
...  
Keyword(s):  
Vitamin D ◽  
Body Fat ◽  
Early Life ◽  
Vitamin D Supplementation ◽  
Lower Percentage ◽  
Cardiometabolic Health ◽  
Vitamin D Status ◽  
Percentage Body Fat ◽  
Hydroxyvitamin D ◽  
25 Hydroxyvitamin D

ABSTRACT Background Vitamin D deficiency is associated with obesity-related conditions, but the role of early life vitamin D status on the development of obesity is poorly understood. Objectives We assessed whether serum 25-hydroxyvitamin D [25(OH)D] at age 1 y was related to metabolic health through adolescence. Methods We quantified serum 25(OH)D in samples obtained at age 1 y from 306 participants in a cohort study in Santiago, Chile. Anthropometry was performed at ages 5, 10, and 16/17 y. At 16/17 y, we determined body composition using DXA and quantified metabolic parameters in a blood sample. We examined the associations of infancy 25(OH)D with BMI-for-age z-score (BMIZ) at ages 5, 10, and 16/17 y; with percentage fat and percentage lean body mass at age 16/17 y; and with a metabolic syndrome (MetS) score and its components at age 16/17 y. Results Infancy 25(OH)D was inversely associated with BMIZ in childhood. Every 25-nmol/L difference in 25(OH)D was related to an adjusted 0.11 units lower BMIZ at age 5 y (95% CI: −0.20, −0.03; P = 0.01) and a 0.09 unit lower BMIZ change from ages 1 to 5 y (95% CI: −0.17, −0.01; P = 0.02). Also, every 25-nmol/L 25(OH)D in infancy was associated with an adjusted 1.3 points lower percentage body fat mass (95% CI: −2.2, −0.4; P = 0.005) and an adjusted 0.03 units lower MetS score (95% CI: −0.05, −0.01; P = 0.01) at age 16/17 y, through inverse associations with waist circumference and the HOMA-IR. Conclusions Serum 25(OH)D at age 1 y is inversely associated with childhood BMIZ, percentage body fat at age 16/17 y, and a MetS score at age 16/17 y. Intervention studies are warranted to examine the effects of vitamin D supplementation in early life on long-term cardiometabolic outcomes.

scholarly journals Skeletal and Extraskeletal Actions of Vitamin D: Current Evidence and Outstanding Questions

2018 ◽  
Vol 40 (4) ◽  
pp. 1109-1151 ◽  
Author(s):  
Roger Bouillon ◽  
Claudio Marcocci ◽  
Geert Carmeliet ◽  
Daniel Bikle ◽  
John H White ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Human Subjects ◽  
Osteoporotic Fractures ◽  
Vitamin D Supplementation ◽  
Current Evidence ◽  
Elderly Subjects ◽  
Vitamin D Status ◽  
Hydroxyvitamin D ◽  
25 Hydroxyvitamin D

AbstractThe etiology of endemic rickets was discovered a century ago. Vitamin D is the precursor of 25-hydroxyvitamin D and other metabolites, including 1,25(OH)2D, the ligand for the vitamin D receptor (VDR). The effects of the vitamin D endocrine system on bone and its growth plate are primarily indirect and mediated by its effect on intestinal calcium transport and serum calcium and phosphate homeostasis. Rickets and osteomalacia can be prevented by daily supplements of 400 IU of vitamin D. Vitamin D deficiency (serum 25-hydroxyvitamin D <50 nmol/L) accelerates bone turnover, bone loss, and osteoporotic fractures. These risks can be reduced by 800 IU of vitamin D together with an appropriate calcium intake, given to institutionalized or vitamin D–deficient elderly subjects. VDR and vitamin D metabolic enzymes are widely expressed. Numerous genetic, molecular, cellular, and animal studies strongly suggest that vitamin D signaling has many extraskeletal effects. These include regulation of cell proliferation, immune and muscle function, skin differentiation, and reproduction, as well as vascular and metabolic properties. From observational studies in human subjects, poor vitamin D status is associated with nearly all diseases predicted by these extraskeletal actions. Results of randomized controlled trials and Mendelian randomization studies are supportive of vitamin D supplementation in reducing the incidence of some diseases, but, globally, conclusions are mixed. These findings point to a need for continued ongoing and future basic and clinical studies to better define whether vitamin D status can be optimized to improve many aspects of human health. Vitamin D deficiency enhances the risk of osteoporotic fractures and is associated with many diseases. We review what is established and what is plausible regarding the health effects of vitamin D.

scholarly journals A Novel Approach Localizes the Association of Vitamin D Status With Insulin Resistance to One Region of the 25-Hydroxyvitamin D Continuum

2013 ◽  
Vol 4 (3) ◽  
pp. 303-310 ◽  
Author(s):  
Robert P. Heaney ◽  
Christine B. French ◽  
Stacie Nguyen ◽  
Mia Ferreira ◽  
Leo L. Baggerly ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Vitamin D ◽  
Vitamin D Status ◽  
Hydroxyvitamin D ◽  
Novel Approach ◽  
25 Hydroxyvitamin D

scholarly journals Circulating 25-Hydroxyvitamin D Levels in Fully Breastfed Infants on Oral Vitamin D Supplementation

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Carol L. Wagner ◽  
Cindy Howard ◽  
Thomas C. Hulsey ◽  
Ruth A. Lawrence ◽  
Sarah N. Taylor ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin D Supplementation ◽  
Vitamin Supplementation ◽  
Oral Vitamin ◽  
Oil Emulsion ◽  
Hydroxyvitamin D ◽  
Breastfed Infants ◽  
25 Hydroxyvitamin D ◽  
The Mean ◽  
Nutritional Vitamin

Objective. To examine the effectiveness of oral vitamin (400 IU) supplementation on the nutritional vitamin D status of breastfeeding infants.Design. As part of a larger ongoing vitamin D RCT trial of lactating women, infants of mothers assigned to control received 1 drop of 400 IU vitamin /day starting at one month of age. Infant 25(OH)D levels (mean S.D.) were measured by RIA at visits 1, 4, and 7.Results. The infant mean S.D. 25(OH)D at baseline was 16.0 9.3 ng/mL (range 1.0–40.8; ); 24 (72.7%) had baseline levels <20 ng/mL (consistent with deficiency). The mean levels increased to 43.6 14.1 (range 18.2–69.7) at 4 months and remained relatively unchanged at month 7: 42.5 12.1 ng/mL (range 18.9–67.2). The change in values between 1 and 4 months and 1 and 7 months was statistically significant , and despite a decrease in dose per kilogram, values were not significantly different between months 4 and 7 .Conclusions. Oral vitamin supplementation as an oil emulsion was associated with significant and sustained increases in 25(OH)D from baseline in fully breastfeeding infants through 7 months.

scholarly journals Associations between Serum-Intact Parathyroid Hormone, Serum 25-Hydroxyvitamin D. Oral Vitamin D Analogs and Metabolic Syndrome in Peritoneal Dialysis Patients: A Multi-Center Cross-Sectional Study

2014 ◽  
Vol 34 (4) ◽  
pp. 447-455 ◽  
Author(s):  
Jie Dong ◽  
Qin Wang ◽  
Meng-Hua Chen ◽  
Hui-Ping Zhao ◽  
Tong-Ying Zhu ◽  
...  
Keyword(s):  
Metabolic Syndrome ◽  
Vitamin D ◽  
Peritoneal Dialysis ◽  
Parathyroid Hormone ◽  
Lower Risk ◽  
Intact Parathyroid Hormone ◽  
Oral Vitamin ◽  
Vitamin D Analogs ◽  
Hydroxyvitamin D ◽  
25 Hydroxyvitamin D

Introduction Although previous studies have suggested associations between serum intact parathyroid hormone (iPTH), 25-hydroxyvitamin D (25(OH)D) and metabolic syndrome (MS) in the general population, these associations are still uncharacterized in peritoneal dialysis (PD) patients. Methods In total, 837 prevalent PD patients from 5 centers in China were enrolled between April 1, 2011 and November 1, 2011. The demographic data, biochemical parameters and medical records were collected, except for serum 25(OH)D which was measured in 347 of 837 patients. The definition of MS was modified from National Cholesterol Education Program Third Adult Treatment Panel (NCEP-ATPIII). Results 55.4% of 837 patients were found to have MS. The median concentration of iPTH, 25(OH)D and doses of oral vitamin D analogs for participants with MS was significantly lower than those without MS. The iPTH, 25(OH)D values and doses of vitamin D analogs were all associated with one or more components of MS. After multivariate adjustment, Low serum iPTH values and oral vitamin D analogs, rather than serum 25(OH)D, were significantly associated with the presence of MS, abnormal fasting blood glucose (FBG) and high-density lipoprotein cholesterol (HDL-C). Compared to iPTH < 130pg/mL, iPTH 130–585 pg/mL and > 585pg/mL were associated with a lower risk of MS with adjusted odds ratio (OR) of 0.59 and 0.33, respectively. Taking vitamin D analogs was also associated with a lower risk of MS with adjusted OR of 0.55. Conclusions Serum iPTH and the use of active vitamin D supplements rather than serum 25(OH)D were independently associated with the presence of MS in patients on PD.

scholarly journals The efficacy of vitamin D3 supplementation in increasing 25-hydroxyvitamin D levels in childhood vitiligo patients receiving 308-nm-excimer light phototherapy

2019 ◽  
Author(s):  
Reiva Farah Dwiyana ◽  
Pramita K.C. Nugrahaini ◽  
D.P. Larasati ◽  
Inne Arline Diana ◽  
Reti Hindritiani ◽  
...  
Keyword(s):  
Vitamin D ◽  
Combination Therapy ◽  
Vitamin D3 ◽  
Vitamin D Supplementation ◽  
Oral Vitamin ◽  
Once Daily ◽  
Hydroxyvitamin D ◽  
Group I ◽  
Vitamin D3 Supplementation ◽  
25 Hydroxyvitamin D

Vitamin D deficiency is a condition often found in various autoimmune diseases, including vitiligo. There were clinical improvements in autoimmune patients who had been given oral vitamin D supplementation, as well as vitiligo patients. This study aimed to analyze the comparison effect of a combination therapy of 308-nmexcimer light phototherapy and vitamin D3 supplementation toward 308-nm-excimer light phototherapy alone to increase of serum 25-(OH)D levels in childhood vitiligo patients. Subjects consisted of 16 childhood vitiligo patients that divided into two groups; group I was given a combination of 308-nm-excimer light phototherapy and 5000 IU of vitamin D3 supplement once daily, while group II was given monotherapy of excimer light. There were highly significant increase of 25-(OH)D serum in both groups which were 324.00±119.066% and 29.84±36.106%, respectively. The very significant result was seen in a comparison of average increased of serum 25-(OH)D levels between both groups. The study concluded that combination of 308-nm-excimer light phototherapy and vitamin D3 supplementation gave a better effect than phototherapy only to increase of serum 25- (OH)D levels in childhood vitiligo patients.

Correlation between vitamin D levels and hard-to-heal wounds: a systematic review

2020 ◽  
Vol 29 (Sup7) ◽  
pp. S24-S30 ◽  
Author(s):  
Karen Smith ◽  
Susan Hewlings
Keyword(s):  
Vitamin D ◽  
Financial Burden ◽  
Vitamin D Supplementation ◽  
Nutritional Deficiencies ◽  
Vitamin D Status ◽  
Hydroxyvitamin D ◽  
Venous Ulcers ◽  
Vitamin D Levels ◽  
25 Hydroxyvitamin D ◽  
The Relationship

Objective: Hard-to-heal wounds are a major biological, psychological, social and financial burden on both individual patients and the broader health system. They are associated with a variety of comorbidities and have a complex aetiology, but are typically associated with nutritional deficiencies, such as low vitamin D levels. This systematic literature review evaluates the current research regarding the connection between inadequate vitamin D status and wound healing. Method: PubMed and EBSCO databases were searched following PRISMA guidelines for primary research studies relating to pressure ulcers, diabetic ulcers or venous ulcers and vitamin D status. Results: A total of 10 studies, involving 2359 participants, met the inclusion criteria. There was a strong correlation between low levels of 25-hydroxyvitamin D and the presence of all three types of hard-to-heal wounds. Conclusion: Research suggests a correlation between low vitamin D levels and hard-to-heal wounds. However, it is not clear if the relationship is causal or only correlational. There is also emerging evidence on the use of vitamin D supplementation for the treatment of hard-to-heal wounds. More research is needed to understand the correlation between vitamin D and hard-to-heal wounds.

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