BACKGROUND: Obesity is associated with hypovitaminosis D. Whether body mass index (BMI) determines the replacement dose of vitamin D to achieve sufficiency is unclear. OBJECTIVE: To determine the relationship between BMI and serum 25-OH vitamin D concentrations and whether the increase in serum 25-OH vitamin D concentrations with vitamin D replacement is dependent on BMI. METHODS: Retrospective review of anthropometric data and serum 25-OH vitamin D concentrations in 95 patients attending an outpatient clinic in a tertiary hospital. In a second component of the study, 17 hospital inpatients with severe vitamin D deficiency (serum 25-OH D concentrations<6 ng/mL [15 nmol/L]) were supplemented with 10,000 units vitamin D(3)/day orally for 1 week. Biochemistry and anthropometric measurements were compared before and after vitamin D replacement. RESULTS: Serum 25-OH vitamin D concentrations correlated negatively with BMI in the 95 outpatients (r(2) = 0.11, P <.01). In the longitudinal study, BMI correlated positively with serum intact parathyroid hormone (r(2) = 0.84, P <.01) and negatively with 1.25-(OH)(2) vitamin D (r(2) = 0.19, P=.06) at baseline. Serum 25-OH D concentrations achieved following 1 week of vitamin D(3) replacement correlated negatively with BMI (r(2) = 0.63, P <.01). CONCLUSION: Efficacy of vitamin D supplementation is dependent on BMI. Overweight and obese patients with hypovitaminosis D might require higher doses of vitamin D to achieve vitamin D repletion compared with individuals with normal body weight.
BACKGROUND: Obesity is associated with hypovitaminosis D. Whether body mass index (BMI) determines the replacement dose of vitamin D to achieve sufficiency is unclear. OBJECTIVE: To determine the relationship between BMI and serum 25-OH vitamin D concentrations and whether the increase in serum 25-OH vitamin D concentrations with vitamin D replacement is dependent on BMI. METHODS: Retrospective review of anthropometric data and serum 25-OH vitamin D concentrations in 95 patients attending an outpatient clinic in a tertiary hospital. In a second component of the study, 17 hospital inpatients with severe vitamin D deficiency (serum 25-OH D concentrations<6 ng/mL [15 nmol/L]) were supplemented with 10,000 units vitamin D(3)/day orally for 1 week. Biochemistry and anthropometric measurements were compared before and after vitamin D replacement. RESULTS: Serum 25-OH vitamin D concentrations correlated negatively with BMI in the 95 outpatients (r(2) = 0.11, P <.01). In the longitudinal study, BMI correlated positively with serum intact parathyroid hormone (r(2) = 0.84, P <.01) and negatively with 1.25-(OH)(2) vitamin D (r(2) = 0.19, P=.06) at baseline. Serum 25-OH D concentrations achieved following 1 week of vitamin D(3) replacement correlated negatively with BMI (r(2) = 0.63, P <.01). CONCLUSION: Efficacy of vitamin D supplementation is dependent on BMI. Overweight and obesepatients with hypovitaminosis D might require higher doses of vitamin D to achieve vitamin D repletion compared with individuals with normal body weight.
Authors: Anand Vaidya; Bei Sun; Carol Larson; John P Forman; Jonathan S Williams Journal: J Clin Endocrinol Metab Date: 2012-04-26 Impact factor: 5.958
Authors: Sankar D Navaneethan; Jesse D Schold; Susana Arrigain; Stacey E Jolly; Anil Jain; Martin J Schreiber; James F Simon; Titte R Srinivas; Joseph V Nally Journal: Am J Kidney Dis Date: 2011-08-04 Impact factor: 8.860
Authors: Leigh A Peterson; Lawrence J Cheskin; Margaret Furtado; Konstantinos Papas; Michael A Schweitzer; Thomas H Magnuson; Kimberley E Steele Journal: Obes Surg Date: 2016-04 Impact factor: 4.129