title: [Natural evolution of excess body weight (overweight and obesity) in children].
abstract: OBJECTIVE
  To analyze the chronological evolution of excess body weight (overweight and obesity) in order to raise public awareness within the different areas of intervention (family, school, business environment, health services) and to take effective actions.
  
  
  METHODS
  Weight, height and body mass index (BMI) of 604 healthy subjects (307 males and 297 females) have been recorded at birth and at the age of 1, 2, 3, 4, 6, 8, 10, 12 and 14 years. The excess body weight has been calculated according to national references from Ferrández et al.
  
  
  RESULTS
  Prevalence of excess body weight at age 14 years was significantly higher (P<.05) in males (29%) than in females (12.8%). BMI (kg/m2) was significantly higher (P<.05) for both sexes in every age period, except for birth and age 1 year, in those patients with excess body weight at age 14, with respect to patients with normal nutritional status of the same age. Those groups with excess body weight at age 14 showed a BMI (Z-score) reaching overweight or obesity levels at age 4, and progressively increasing.
  
  
  CONCLUSIONS
  Excess body weight probably starts at early stages in life, when dietary habits of the child depends almost exclusively on family habits, and may be aggravated during school attendance. Finally, a disproportionate weight increase occurs in adolescence that is probably related to unhealthy dietary habits and way of life.
authors.affiliation: Servicio de Pediatría, Complejo Hospitalario de Navarra, Servicio Navarro de Salud, Osasunbidea, Pamplona, España. Electronic address: tduratra@cfnavarra.es.
authors.forename: T
authors.initials: T
authors.lastname: Durá Travé
authors.forename: F
authors.initials: F
authors.lastname: Gallinas Victoriano
mesh_terms: D000293:Adolescent; D001835:Body Weight; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008137:Longitudinal Studies; D008297:Male; D009765:Obesity / Q000453:epidemiology / Q000517:prevention & control; D050177:Overweight / Q000453:epidemiology / Q000517:prevention & control; D013997:Time Factors; D015430:Weight Gain
keywords: Adolescentes; Adolescents; Body Mass Index; Children; Indice de masa corporal; Niños; Obesidad; Obesity; Overweight; Prevalence; Prevalencia; Sobrepeso