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Association between Personality Traits and Obesity indices: Family and Co-twin Analysis

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Authors
S. Yang; Y. Yang; J. Kim; Y. Song; K. Lee; J. Sung
Issue Date
2012-04
Publisher
AUSTRALIAN ACAD PRESS
Citation
Twin Research and Human Genetics Vol.15 No.2, pp. 257-258
Keywords
복합학
Abstract
Personality traits of an individual affect one's attitude towards life and one's life style factors determining health status. Since emotional disruption, such as depression and mood disorders, and unhealthy life habits are established risk factors of obesity, investigating the association between personality, life style, and obesity will lead to development of efficient intervention or preventive measure for obesity, according to their personality profiles. To this end, we attempted to explore the associations between Temperament and Character Inventory (TCI)'s seven dimensions and obesity indices: body mass index (BMI), waist circumference, waist hip ratio (WHR), trunk and total body fat percent measured by Dual-energy X-ray absorptiometry (DXA) in Korean twins and their families Additionally, we aim to discriminate environmental and genetic effect of TCI on obesity using pair-wise analysis of each and combined monozygotic twins (MZ), dizygotic twins (DZ) and sibling pairs adjusted for age and sex. We expected that estimating non-genetic association between personality traits and obesity will specifically show potential target chains interconnecting personality, life style and obesity.A total of 3079 individuals (1217 men, 661 families) of the Healthy Twin Study in Korea were involved in this study. This population includes 531 MZ pairs, 120 DZ pairs, and 1172 sibling pairs. Association between TCI and obesity was analyzed using adjusting for age, sex, smoking history and alcohol consumption. A random effect model (REM) was applied to adjust familial correlations. For co-twin and sib-pair analyses pair-wise regression models using pairwise-difference values were used. In conventional regression analyses (REM), among seven domains of TCI, novelty seeking had the strongest association with BMI. Decreased persistence (β =-0.0003), self-directedness (β =-0.00024), cooperativeness (β =-0.00028), and self-transcendence (β =-0.00026) had association with WHR. In pair-wise regression model, an association between persistence and WHR /trunk fat percent were further dissected; βW in MZ data was higher than βW in DZ-sibling data and pooled data, indicating that persistence is associated obesity, and in this association, there are more environmental effects than genetic effect.The results all confirm the previous findings that self-transcendence resulted with negative association with WHR. By comparing the βW of different datasets, we could conclude that there is high environmental effect on the association, and that there is more environmental effect on the TCI associated obesity than genetic effect. Suggesting an individual's personality profiles can be integrated into personalized intervention of obesity.
ISSN
1832-4274
Language
English
URI
https://hdl.handle.net/10371/94262
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Graduate School of Public Health (보건대학원)Dept. of Public Health (보건학과)Journal Papers (저널논문_보건학과)
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