title: Two-year changes in lipids and lipoproteins associated with the maintenance of a 5% to 10% reduction in initial weight: some findings and some questions.
abstract: OBJECTIVE
  This study assessed whether a 5% to 10% reduction in initial weight would be associated with as favorable long-term (i.e., 100 weeks) changes in lipids and lipoproteins, as have been observed on a short-term basis (i.e., 8 weeks).
  
  
  METHODS
  This was a prospective evaluation of 25 obese women, each of whom had lost > or =5% of initial weight during 48 weeks of treatment and had maintained a weight loss of this magnitude at 1-year follow-up (week 100). Lipids and lipoproteins were obtained at baseline and at weeks 8, 24, 48, and 100. All participants had a baseline total cholesterol > or =5.17 mmol/L (200 mg/dL).
  
  
  RESULTS
  At the end of the first 8 weeks, weight fell an average of 11.7+/-2.8%, total cholesterol 20.6+/-7.5%, low-density-lipoprotein (LDL) cholesterol 23.0+/-18.1%, and triglycerides 26.0+/-20.1%. At week 48, weight had fallen to 20.1+/-7.0% below baseline, but total cholesterol and LDL cholesterol were reduced only 11.5+/-10.4% and 12.0+/-14.0% below baseline, respectively. These latter reductions were significantly (p<0.05) smaller than those observed at week 8, despite the larger weight loss at week 48. High-density-lipoprotein cholesterol declined significantly (p<0.05) during the first 8 weeks, but returned to baseline values by week 24. Patients gained 7.4+/-7.4 kg from weeks 48 to 100, during which time total and LDL cholesterol (but not triglycerides) rose significantly (p<0.05). Patients who, at week 100, maintained losses >10% of initial weight had significantly greater reductions in total and LDL cholesterol values than did patients who maintained losses of only 5% to 10% of initial weight.
  
  
  CONCLUSIONS
  Results of this study underscore the importance of assessing long-term changes in weight-related health complications when patients have lost weight but are no longer dieting (and exercising) as aggressively as they did during the initial months of treatment.
authors: Department of Psychiatry, University of Pennsylvania School of Medicine, Philadelphia 19104, USA. wadden@mail.med.upenn.edu
authors: T A
authors: TA
authors: Wadden
authors: D A
authors: DA
authors: Anderson
authors: G D
authors: GD
authors: Foster
mesh_terms: D000328:Adult; D001521:Behavior Therapy; D002784:Cholesterol / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D004038:Diet, Reducing; D015444:Exercise; D005260:Female; D006801:Humans; D008055:Lipids / Q000097:blood*; D008074:Lipoproteins / Q000097:blood*; D008875:Middle Aged; D009765:Obesity / Q000097:blood / Q000628:therapy*; D011446:Prospective Studies; D014280:Triglycerides / Q000097:blood; D015431:Weight Loss
chemical_list: D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D008055:Lipids; D008074:Lipoproteins; D014280:Triglycerides; D002784:Cholesterol