title: Change in height, weight and body mass index: Longitudinal data from the HUNT Study in Norway.
abstract: OBJECTIVE
  The aim of this study was to analyse changes in body weight and height, and the changes in the prevalence of overweight and obesity.
  
  
  METHODS
  Prospective population based study with 11-year follow-up.
  
  
  METHODS
  Norwegian men (n=21565) and women (n=24337) aged 20 years or more who participated in two health surveys, the first in 1984-1986 and the other in 1995-1997.
  
  
  METHODS
  Height and weight were measured by using standardised procedures at both surveys, and we computed body mass index (BMI) as weight in kilo divided by the squared value of height in meters.
  
  
  RESULTS
  Participants who were younger than 50 years at the first survey showed a large increase in body weight, and men and women aged 20-29 years increased their weight with an average of 7.9 kg and 7.3 kg, respectively. Contradictory, participants who were 70 years or older had on average a weight loss. The prevalence of overweight (BMI=25.0-29.9 kg/m(2)) and obesity (BMI>/=30 kg/m(2)) increased between the surveys, especially in the youngest age groups. Overall, the proportion classified as obese increased from 6.7 to 15.5% among men and from 11.0 to 21.0% among women. Some of this increase was due to a reduction in height, which was most pronounced in the oldest age groups.
  
  
  CONCLUSIONS
  During approximately 10 years, body weight increased in all age groups below 70 years, and the prevalence of overweight and obese persons was approximately 20% higher at the second survey compared with the first survey.
authors.affiliation: Department of Public Health and General Practice, Norwegian University of Science and Technology, Norway. wenche.b.droyvold@sintef.no
authors.forename: W B
authors.initials: WB
authors.lastname: Drøyvold
authors.forename: T I L
authors.initials: TI
authors.lastname: Nilsen
authors.forename: O
authors.initials: O
authors.lastname: Krüger
authors.forename: T L
authors.initials: TL
authors.lastname: Holmen
authors.forename: S
authors.initials: S
authors.lastname: Krokstad
authors.forename: K
authors.initials: K
authors.lastname: Midthjell
authors.forename: J
authors.initials: J
authors.lastname: Holmen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D001824:Body Constitution / Q000502:physiology*; D001827:Body Height / Q000502:physiology; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology; D005260:Female; D006306:Health Surveys; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009664:Norway / Q000453:epidemiology; D009765:Obesity / Q000453:epidemiology* / Q000503:physiopathology; D050177:Overweight / Q000502:physiology; D012737:Sex Factors; D013851:Thinness / Q000453:epidemiology / Q000503:physiopathology; D015430:Weight Gain