Effect of length of treatment on weight loss

J Consult Clin Psychol. 1989 Jun;57(3):450-2.


In this study we tested whether the efficacy of behavior therapy for obesity might be improved by lengthening the duration of treatment. Forty-eight obese clients were randomly assigned to either a standard treatment of 20 weekly sessions or to an extended treatment of 40 weekly sessions. The content of each program was identical, but the treatment procedures were introduced in a more gradual manner in the extended condition. At Week 20, the conditions showed equivalent weight losses. At 40- and 72-week evaluations, however, the extended treatment produced significantly greater mean weight losses than did the standard treatment.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adult
  • Behavior Therapy / methods*
  • Diet, Reducing / psychology*
  • Female
  • Follow-Up Studies
  • Humans
  • Long-Term Care
  • Male
  • Middle Aged
  • Obesity / psychology
  • Obesity / therapy*
  • Weight Loss*