title: The incidence of vitamin D deficiency in the obese: a retrospective chart review.
abstract: OBJECTIVE
  To determine whether the obese population is more likely to be vitamin D deficient compared to healthy and overweight individuals.
  
  
  METHODS
  A retrospective chart review was performed for patients seen in two ambulatory clinics in South Florida over a 1-year period (n=402). Patients' vitamin D levels drawn during annual wellness visits were analyzed. Subjects were categorized based on body mass index (BMI) as normal (BMI <24.9), overweight (BMI 25.0-29.9), and obese (BMI >30.0). Their 25-OH vitamin D status was defined as normal (>30 ng/mL), insufficient (20.0-29.9 ng/mL), and deficient (<20 ng/mL). The study included both men and women of black, white, Hispanic, and Asian races. Other variables in the study included age, history of hypertension, and diabetes. Patients with conditions leading to vitamin D malabsorption (chronic pancreatitis, celiac disease, Crohn's disease, cystic fibrosis, ileocecal resection) were excluded. Patients with prior vitamin D supplementation were also excluded.
  
  
  RESULTS
  The results of the study indicated a significant association of vitamin D deficiency and obesity (p<0.05). Patients who were obese had a relative risk of 3.36 (95% CI: 1.50-7.54) for vitamin D deficiency compared to subjects with normal BMI. The study also showed a significant association between vitamin D levels and obesity when controlling for age, race, and presence of hypertension (p <0.05), with Asians and blacks more likely to be vitamin D deficient.
  
  
  CONCLUSIONS
  These results demonstrated that obesity was a risk factor for vitamin D deficiency in all races, especially the Asian and black populations. This suggests that physicians should screen for vitamin D deficiency in the obese populations, especially among Asian and black races.
authors: Internal Medicine Resident, Broward Health Medical Center, Ft. Lauderdale, FL, USA; deepudaniel17@yahoo.com.
authors: Deepu
authors: D
authors: Daniel
authors: Health Professions Division, Nova Southeastern University, Davie, FL, USA.
authors: Patrick
authors: P
authors: Hardigan
authors: Internal Medicine Resident, Broward Health Medical Center, Ft. Lauderdale, FL, USA.
authors: Natasha
authors: N
authors: Bray
authors: Internal Medicine, Health Professions Division, Nova Southeastern University College of Medicine, Davie, FL, USA.
authors: Dennis
authors: D
authors: Penzell
authors: Internal Medicine, Health Professions Division, Nova Southeastern University College of Medicine, Davie, FL, USA.
authors: Christina
authors: C
authors: Savu
keywords: 25-OH vitamin D; diabetes; hypertension; obesity
references: J Pediatr. 2012 Nov;161(5):848-54
references: 22677566
references: Am J Clin Nutr. 2008 Dec;88(6):1519-27
references: 19064511
references: Am J Clin Nutr. 2000 Sep;72(3):690-3
references: 10966885
references: J Am Coll Nutr. 2005 Dec;24(6 Suppl):569S-73S
references: 16373956
references: J Am Coll Nutr. 2001 Apr;20(2 Suppl):198S-207S
references: 11349943
references: NCHS Data Brief. 2012 Apr;(93):1-8
references: 22617299
references: JAMA. 2014 Feb 26;311(8):806-14
references: 24570244
references: Appl Health Econ Health Policy. 2012 May 1;10(3):163-73
references: 22510025
references: Obes Surg. 1993 Nov;3(4):421-424
references: 10757956
references: J Bone Miner Res. 2010 Jan;25(1):64-71
references: 19580459