title: Association of obesity with IgE levels and allergy symptoms in children and adolescents: results from the National Health and Nutrition Examination Survey 2005-2006.
abstract: BACKGROUND
  The prevalence of both obesity and allergic disease has increased among children over the last several decades. Previous literature on the relationship between obesity and allergic disease has been inconsistent. It is not known whether systemic inflammation could be a factor in this relationship.
  
  
  OBJECTIVE
  We sought to examine the association of obesity with total and allergen-specific IgE levels and allergy symptoms in US children and adolescents and to assess the role of C-reactive protein.
  
  
  METHODS
  National Health and Nutrition Examination Survey data from 2005-2006 included measurement of total and allergen-specific IgE levels and allergy questions. Overweight was defined as the 85th or greater to less than the 95th percentile of body mass index for age, and obesity was defined as the 95th percentile or greater. Linear and logistic regression models were used to examine the association of weight categories with total IgE levels, atopy, allergen-specific IgE levels, and allergy symptoms among youth aged 2 to 19 years.
  
  
  RESULTS
  Geometric mean total IgE levels were higher among obese (geometric mean ratio, 1.31; 95% CI, 1.10-1.57) and overweight (ratio, 1.25; 95% CI, 1.02-1.54) children than among normal-weight children. The odds ratio (OR) for atopy (any positive specific IgE measurement) was increased in the obese children compared with that seen in those of normal weight; this association was driven largely by allergic sensitization to foods (OR for atopy, 1.26 [95% CI, 1.03-1.55]; OR for food sensitization, 1.59 [95% CI, 1.28-1.98]). C-reactive protein levels were associated with total IgE levels, atopy, and food sensitization.
  
  
  CONCLUSIONS
  Obesity might be a contributor to the increased prevalence of allergic disease in children, particularly food allergy. Systemic inflammation might play a role in the development of allergic disease.
authors.affiliation: Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA. cindy_visness@rhoworld.com
authors.forename: Cynthia M
authors.initials: CM
authors.lastname: Visness
authors.forename: Stephanie J
authors.initials: SJ
authors.lastname: London
authors.forename: Julie L
authors.initials: JL
authors.lastname: Daniels
authors.forename: Jay S
authors.initials: JS
authors.lastname: Kaufman
authors.forename: Karin B
authors.initials: KB
authors.lastname: Yeatts
authors.forename: Anna-Maria
authors.initials: AM
authors.lastname: Siega-Riz
authors.forename: Andrew H
authors.initials: AH
authors.lastname: Liu
authors.forename: Agustin
authors.initials: A
authors.lastname: Calatroni
authors.forename: Darryl C
authors.initials: DC
authors.lastname: Zeldin
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000032:analysis* / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006306:Health Surveys; D006801:Humans; D006967:Hypersensitivity / Q000453:epidemiology* / Q000276:immunology; D007073:Immunoglobulin E / Q000097:blood*; D016015:Logistic Models; D008297:Male; D009749:Nutrition Surveys; D009765:Obesity / Q000276:immunology*; D012307:Risk Factors; D014481:United States / Q000453:epidemiology; D055815:Young Adult
chemical_list: D007073:Immunoglobulin E; D002097:C-Reactive Protein