Can Elvis Pretzley and the Fitwits improve knowledge of obesity, nutrition, exercise, and portions in fifth graders?

Int J Obes (Lond). 2010 Jul;34(7):1134-42. doi: 10.1038/ijo.2010.58. Epub 2010 Mar 30.


Objective: To determine the effectiveness of an educational intervention, created with a human-centered design approach, on children's knowledge and beliefs related to obesity and nutrition.

Design: Pre-post intervention: we evaluated fifth graders (aged 9-12) from five urban schools using a survey instrument at 1 week before intervention, immediately after intervention, and 1 week later after intervention.

Subjects: Of 189 fifth graders enrolled in the schools, 165 consented students (87.3%) completed baseline data. We obtained immediate post-intervention data from 94% of them and 1-week post-intervention data from 88%.

Results: Of the 14 instrument questions that covered items under obesity, disease, nutrition, portion sizes, and exercise, 11 showed significant improvements in the percentage of correct answers. The children's knowledge in specific areas, including the meaning of the term 'obesity' and portion sizes, increased dramatically. Participatory design, child-inspired characters, hand-based portions, traditional games, and attention to reception by the students resulted in an engaging presentation.

Conclusion: Simplified health vocabulary and multiple modes of presentation resulted in accessible and understandable health education regarding obesity, nutrition, exercise, and portion size. This study yields compelling evidence that the Fitwits tools are an effective method to promote knowledge about obesity. Future studies are needed to determine whether this knowledge can affect health outcomes.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Body Mass Index
  • Child
  • Female
  • Health Education / methods*
  • Health Knowledge, Attitudes, Practice
  • Health Promotion
  • Humans
  • Male
  • Obesity / prevention & control*
  • Obesity / psychology*
  • Risk Reduction Behavior
  • Schools
  • Students / psychology