title: Seven-year trends in body weight and associations with lifestyle and behavioral characteristics in black and white young adults: the CARDIA study.
abstract: OBJECTIVE
  This study estimated the amount of weight change in a biracial cohort of young adults and the separate components attributable to time-related and aging-related changes, as well as identified possible determinants of weight change.
  
  
  METHODS
  In this population-based prospective study of 18- to 30-year-old African-American and White men and women, body weight and prevalence of overweight were measured from 1985/86 to 1992/93.
  
  
  RESULTS
  Average weight increased over the 7 years, increases ranging from 5.2 kg (SE = 0.2, n = 811) in White women to 8.5 kg (SE = 0.3, n = 882) in African-American women. Significant time-related increases in weight, ranging from 2.0 kg (SE = 1.0) in White women to 4.8 kg (SE = 1.0, n = 711) in African-American men, accounted for 40% to 60% of the average total weight gain. Aging-related increases were also significant, ranging from 2.6 kg (SE = 0.8, n = 944) in White men to 5.0 kg (SE = 1.1) in African-American women. The prevalence of overweight increased progressively in each group. Decreased physical fitness was most strongly associated with weight gain in both sexes.
  
  
  CONCLUSIONS
  The observed dramatic time-related weight gains, most likely due to secular (period-related) trends, are a serious public health concern.
authors.affiliation: Division of Preventive Medicine, School of Medicine, University of Alabama at Birmingham 35205, USA.
authors.forename: C E
authors.initials: CE
authors.lastname: Lewis
authors.forename: D E
authors.initials: DE
authors.lastname: Smith
authors.forename: D D
authors.initials: DD
authors.lastname: Wallace
authors.forename: O D
authors.initials: OD
authors.lastname: Williams
authors.forename: D E
authors.initials: DE
authors.lastname: Bild
authors.forename: D R
authors.initials: DR
authors.lastname: Jacobs
mesh_terms: D000293:Adolescent; D000328:Adult; D001741:Black or African American; D000375:Aging / Q000502:physiology; D001519:Behavior; D001835:Body Weight; D003625:Data Collection; D005260:Female; D006801:Humans; D008019:Life Style; D008297:Male; D009765:Obesity; D010809:Physical Fitness; D011446:Prospective Studies; D015430:Weight Gain; D044465:White People