title: Physically active lifestyle does not decrease the risk of fattening.
abstract: BACKGROUND
  Increasing age is associated with declining physical activity and a gain in fat mass. The objective was to observe the consequence of the age-associated reduction in physical activity for the maintenance of energy balance as reflected in the fat store of the body.
  
  
  RESULTS
  Young adults were observed over an average time interval of more than 10 years. Physical activity was measured over two-week periods with doubly labeled water and doubly labeled water validated triaxial accelerometers, and body fat gain was measured with isotope dilution. There was a significant association between the change in physical activity and the change in body fat, where a high initial activity level was predictive for a higher fat gain.
  
  
  CONCLUSIONS
  The change from a physically active to a more sedentary routine does not induce an equivalent reduction of energy intake and requires cognitive restriction to maintain energy balance.
authors.affiliation: Department of Human Biology, Maastricht University, Maastricht, The Netherlands. K.Westerterp@HB.Unimaas.NL
authors.forename: Klaas R
authors.initials: KR
authors.lastname: Westerterp
authors.forename: Guy
authors.initials: G
authors.lastname: Plasqui
mesh_terms: D000273:Adipose Tissue; D000328:Adult; D000375:Aging / Q000502:physiology*; D015992:Body Mass Index; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008019:Life Style; D008297:Male; D009765:Obesity / Q000503:physiopathology*; D012307:Risk Factors; D055815:Young Adult