Korean J Fam Pract. 2018; 8(2): 311-316  https://doi.org/10.21215/kjfp.2018.8.2.311
The Relationship between Serum Vitamin D and Obesity in a Community Dwellers Aging from 30s to 40s
Soo-Jin Ma1, Sun Hur2, Hyung-Ho Choi1,*
1Department of Family Medicine, College of Medicine, Chosun University; 2Department of Medicine, Graduate School of Chosun University, Gwangju, Korea
Hyung-Ho Choi
Tel: +82-63-220-3534, Fax: +82-63-223-0031
E-mail: hhchoi@chosun.ac.kr
ORCID: http://orcid.org/0000-0002-5627-4372
Received: March 7, 2017; Revised: September 11, 2017; Accepted: October 8, 2017; Published online: April 20, 2018.
© The Korean Academy of Family Medicine. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: In many recent studies, vitamin D deficiency has been demonstrated to be associated with obesity. Korea is one of the countries in which vitamin D deficiencies are prevalent, and the obesity rate in adults over 19 years of age is 30%. Hence, the purpose of this study was to analyze the relationship between vitamin D (25-hydroxyvitamin D, 25[OH]D) standard and obesity (body mass index [BMI], waist circumference) in adults in their 30s to 40s who were enrolled at a university hospital health promotion center.
Methods: Subjects were limited to adults in their 30s to 40s. Odds ratios of the vitamin D (25[OH]D)-deficient and -sufficient groups were calculated through logistic regression analysis to identify differences in obesity indicated by BMI and waist circumference. Linear regression analysis was used to determine the effect of serum vitamin D (25[OH]D) concentrate on BMI and waist circumference. The calibrated variables were age, marital status, smoking, alcohol consumption, occupation, and physical activity levels.
Results: The average serum 25(OH)D concentrates of research subjects were lower than the standard value (20 ng/mL). Serum vitamin D concentration used obese rate was not related to BMI in both genders. However, waist circumference in men was shown to significantly affect abdominal obesity according to serum 25(OH)D concentrate. Abdominal obesity rate reduced to 69.7% when serum 25(OH)D was sufficient. Waist circumference decreased by about 0.2 cm as serum 25(OH)D concentrate increased by 1 ng/mL.
Conclusion: Men in their 30s to 40s with high levels of vitamin D (25[OH]D) exhibited smaller waist circumferences.
Keywords: Vitamin D; Obesity; Body Mass Index; Waist Circumference; Adult
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