Abstract
Underreporting of energy intake in diet recalls is common, especially among obese
individuals. Incentives have been used to ameliorate the problem, but are typically
provided without efficacy assessment. The present study sought to determine whether
financial incentives decrease underreporting in diet recalls. Three groups were used
to assess incentive timing effects in this parallel group crossover study. One group
received a $50 bonus for accurate diet recalls on the first two of four recalls. Accuracy
was purportedly verified by salivary analysis. Another group received the $50 bonus
for the last two recalls. A third group received no incentive. Mean energy intake
during the first two visits was compared to mean energy intake during the last two
visits to assess differences resulting from the incentive. Underreporters were identified
using a Goldberg cutoff and energy intake <76% of estimated energy expenditure. Energy
intake did not differ within or between groups at any time, and the number of underreporters
was not associated with group at any time. Overall, the incentive was ineffective
in this small, homogeneous sample. Future studies should assess different forms of
incentives, other study populations, and the probability of incentives causing undereating.
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Biography
S. Hendrickson is a graduate research assistant and R. Mattes is a professor, Department of Foods and Nutrition, Purdue University, West Lafayette, IN.
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© 2007 American Dietetic Association. Published by Elsevier Inc. All rights reserved.
