Mental ill-health across the continuum of body mass index.

Publisher: BioMed Central Country of Publication: England NLM ID: 100968562 Publication Model: Electronic Cited Medium: Internet ISSN: 1471-2458 (Electronic) Linking ISSN: 14712458 NLM ISO Abbreviation: BMC Public Health Subsets: MEDLINE

Original Publication: London : BioMed Central, [2001-

Body Mass Index*; Depression/*epidemiology ; Mental Health/*statistics & numerical data ; Suicide/*statistics & numerical data; Adolescent ; Adult ; Alcohol Drinking ; Exercise ; Female ; Humans ; Interviews as Topic ; Male ; Middle Aged ; Population Surveillance ; Prevalence ; Sex Factors ; Smoking ; Social Class ; South Australia/epidemiology ; Young Adult

Background: Several studies have found a non-linear relationship between mental ill-health and BMI with higher rates in both the underweight and the obese. This study evaluated the shape of the relationship between BMI and distress, suicidal ideation and self-reported mental ill-health conditions in a large population sample.
Methods: Data were drawn from the South Australian Monitoring and Surveillance System (SAMSS) for the years 2002 to 2009 (n = 46,704). SAMSS monitors population trends in state and national risk factors and chronic diseases. Samples are drawn from all households with a functioning number in the Australian White Pages. Computer assisted telephone interviews collected information on self-reported height and weight, demographic and health behaviours. Respondents completed the Kessler Distress and suicidal ideation scales and reported specific mental ill-health conditions. BMI was categorized into deciles to allow for assessment of the shape of any associations with other variables. Logistic regression was used to examine associations between each mental ill-health condition and BMI-decile controlling for age in the base model. This was followed by a full model that added SES and the health-adverse coping behaviours of smoking, alcohol and physical activity to test for changes from the base model.
Results: Non-linear associations were observed between BMI-decile and mental ill-health but statistically significantly greater odds of mental ill-health were observed only in the obese and not in the underweight after controlling for age, health-adverse behaviours and socioeconomic status. The association between BMI and mental ill-health might best be described as 'threshold'. Elevated odds were apparent for middle-aged persons, whereas younger and older individuals had a significantly lower odds of having a mental ill-health condition.
Conclusions: In conclusion, this study has provided no support for the hypothesis of increased mental ill-health problems in the underweight but it has demonstrated the non-linear relationships between BMI and mental ill-health and between BMI and health-adverse behaviours. Non-linear relationships with BMI need to be recognized and addressed during analysis.

J Psychosom Res. 2006 Mar;60(3):263-71. (PMID: 16516658)
JAMA. 2005 Apr 20;293(15):1861-7. (PMID: 15840860)
J Clin Epidemiol. 2001 Sep;54(9):916-20. (PMID: 11520651)
Am J Prev Med. 2004 Feb;26(2):126-9. (PMID: 14751323)
Acta Psychiatr Scand. 1989 May;79(5):481-9. (PMID: 2750549)
Eur J Epidemiol. 2005;20(9):747-54. (PMID: 16170657)
Aust N Z J Psychiatry. 2009 Jul;43(7):652-8. (PMID: 19530022)
J Immigr Health. 2005 Apr;7(2):127-31. (PMID: 15789165)
J Am Geriatr Soc. 2008 Jan;56(1):76-83. (PMID: 18031486)
Int J Obes (Lond). 2011 Mar;35(3):401-8. (PMID: 20680015)
Aust N Z J Public Health. 2006 Jun;30(3):238-46. (PMID: 16800200)
BMC Cardiovasc Disord. 2007 Dec 18;7:38. (PMID: 18088433)
Int J Obes (Lond). 2010 Mar;34(3):407-19. (PMID: 19997072)
Matern Child Health J. 2006 Jul;10(4):385-90. (PMID: 16673179)
Am J Epidemiol. 2007 Oct 15;166(8):975-82. (PMID: 17670912)
Am J Epidemiol. 2008 Jan 15;167(2):193-202. (PMID: 17981889)
Int J Obes Relat Metab Disord. 2002 Aug;26(8):1046-53. (PMID: 12119569)
Soc Psychiatry Psychiatr Epidemiol. 2008 Jan;43(1):63-71. (PMID: 17960318)
Obesity (Silver Spring). 2008 Aug;16(8):1926-32. (PMID: 18551106)
Int J Cardiol. 2005 Jan;98(1):123-31. (PMID: 15676176)
Obesity (Silver Spring). 2006 Oct;14(10):1708-15. (PMID: 17062799)
JAMA. 2006 Feb 15;295(7):776-83. (PMID: 16478900)
Epidemiol Rev. 2011;33:122-34. (PMID: 21624963)
Psychol Assess. 2006 Mar;18(1):62-70. (PMID: 16594813)
Obes Res. 2003 Feb;11(2):209-16. (PMID: 12582216)
Obes Rev. 2008 Nov;9(6):572-81. (PMID: 18518906)
J Am Geriatr Soc. 2004 May;52(5):741-8. (PMID: 15086655)
J Affect Disord. 2004 Mar;78(3):279-84. (PMID: 15013255)
BMC Public Health. 2009 Aug 20;9:302. (PMID: 19695085)
Obes Res. 2004 May;12(5):854-61. (PMID: 15166307)
Eur J Clin Nutr. 2010 May;64(5):475-82. (PMID: 20216568)
Qual Life Res. 2007 Dec;16(10):1595-603. (PMID: 17957495)
J Psychosom Res. 2008 Jan;64(1):71-80. (PMID: 18158002)
Eur J Public Health. 2006 Jun;16(3):325-31. (PMID: 16162598)
Int J Obes (Lond). 2008 Apr;32(4):715-21. (PMID: 18408736)
BMC Med Res Methodol. 2010 Aug 26;10:77. (PMID: 20738884)
Prev Med. 2003 Jul;37(1):61-7. (PMID: 12799130)
BMC Public Health. 2009 Jan 13;9:14. (PMID: 19144098)

Date Created: 20111007 Date Completed: 20120223 Latest Revision: 20211020

20231215

PMC3209694

10.1186/1471-2458-11-765

21975214