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Association between body mass index and mental health among Scottish adult population: a cross-sectional study of 37272 participants

Published online by Cambridge University Press:  25 November 2013

Z. Ul-Haq ,
D. F. Mackay ,
E. Fenwick  and
J. P. Pell
Z. Ul-Haq
Affiliation:
Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK Institute of Public Health and Social Sciences, Khyber Medical University, Peshawar, KPK, Pakistan
D. F. Mackay
Affiliation:
Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
E. Fenwick
Affiliation:
Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
J. P. Pell*
Affiliation:
Institute of Health and Wellbeing, University of Glasgow, Glasgow, UK
*
* Address for correspondence: J. P. Pell, M.D., Henry Mechan Professor of Public Health, Institute of Health and Wellbeing, University of Glasgow, 1 Lilybank Gardens, Glasgow G12 8RZ, UK. (Email: [email protected])
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Abstract

Background

The evidence is conflicting as to whether body mass index (BMI) is associated with mental health and, if so, to what extent it varies by sex and age. We studied mental health across the full spectrum of BMI among the general population, and conducted subgroup analyses by sex and age.

Method

We undertook a cross-sectional study of a representative sample of the Scottish adult population. The Scottish Health Survey provided data on mental health, measured by the General Health Questionnaire-12 (GHQ), BMI, demographic and life-style information. Good mental health was defined as a GHQ score <4, and poor mental health as a GHQ score ⩾4. Logistic regression models were applied.

Results

Of the 37 272 participants, 5739 (15.4%) had poor mental health. Overall, overweight participants had better mental health than the normal-weight group [adjusted odds ratio (OR) 0.93, 95% confidence interval (CI) 0.87–0.99, p = 0.049], and individuals who were underweight, class II or class III obese had poorer mental health (class III obese group: adjusted OR 1.26, 95% CI 1.05–1.51, p = 0.013). There were significant interactions of BMI with sex (p = 0.013) and with age (p < 0.001). Being overweight was associated with significantly better mental health in middle-aged men only. In contrast, being underweight at all ages or obese at a young age was associated with significantly poorer mental health in women only.

Conclusions

The adverse associations between adiposity and mental health are specific to women. Underweight women and young women who are obese have poorer mental health. In contrast, middle-aged overweight men have better mental health.

Keywords

Body mass indexGeneral Health Questionnaire-12health-related quality of lifemental healthobesityoverweightunderweight
Type
Original Articles
Information
Psychological Medicine , Volume 44 , Issue 10 , July 2014 , pp. 2231 - 2240
Copyright
Copyright © Cambridge University Press 2013 

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