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Dietary adherence in well-controlled feeding studies
Denise M Hall1, Marlene M Most
1School of Human Ecology, Louisiana State University, Baton Rouge, USA.
Journal of the American Dietetic Association
|September 27, 2005
Summary
Diet adherence in controlled feeding studies is high, with over 90% of participants complying. Most deviations were minor, suggesting controlled diet studies yield reliable results for nutritional research.
Area of Science:
- Nutrition science
- Clinical research methodology
Background:
- Controlled feeding studies require strict participant adherence to provided diets.
- Certain study design elements can challenge participant compliance.
Purpose of the Study:
- To assess participant adherence to strict diets in controlled feeding studies.
- To identify factors influencing adherence and deviations from prescribed diets.
Main Methods:
- Anonymous post-study questionnaires were sent to participants of eight controlled feeding studies.
- 154 participants responded, reporting their dietary adherence and reasons for deviation.
Main Results:
- Over 90% of respondents reported always or usually adhering to the study diet.
- Eating all provided foods was more challenging than avoiding disallowed foods.
- Diet assignment, alcohol allowance, and Saturday meal choices impacted adherence.
Conclusions:
- Participant adherence to controlled feeding study diets is generally excellent.
- Minor deviations are infrequent and unlikely to compromise study validity.
- Findings can inform the design of future controlled feeding studies for improved compliance.
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