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Misreporting of BMI is associated with misreporting of dietary intake among US adults
Author(s) -
Poti Jennifer M,
Mendez Michelle A,
Popkin Barry M
Publication year - 2013
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.27.1_supplement.621.4
Subject(s) - body mass index , medicine , national health and nutrition examination survey , demography , obesity , environmental health , population , sociology
The association between error in body mass index (BMI) calculated from reported weight and height and dietary misreporting is unclear. To estimate this association and its impact on diet‐disease relationships, we studied 1,405 adults 20–60 y from the 2007–08 National Health and Nutrition Examination Survey. Error in BMI was defined as measured BMI (BMI M ) minus reported BMI (BMI R ). Dietary under‐reporters (26.4%) and over‐reporters (1.3%) were classified using the revised Goldberg method to compare physical activity level with energy intake from 24‐hr recalls. Multivariable linear regression estimated the association between BMI error and dietary misreporting. Estimates of BMI‐diet relations were compared using BMI M vs BMI R and with or without adjustment for dietary misreporting. Holding BMI constant, error in BMI was significantly associated with dietary under‐reporting (β = −0.33; 95% CI = −0.59, −0.08). BMI‐diet associations were stronger using BMI M vs BMI R , but differed with adjustment for dietary misreporting among men but not women. For example, adjustment for dietary misreporting was needed to yield a significant difference in BMI M for the highest vs lowest fruit intake among men (β = −1.14; 95% CI = −2.21, −0.06) but not women (β = −2.34; 95% CI = −4.07, −0.60). Misreporting of BMI and dietary intake are associated, but the impact of this joint error on BMI‐diet associations varied by gender and food group. Grant Funding Source : Funding for this study comes from the Robert Wood Johnson Foundation (Grant 67506) and the National Institutes of Health (R01 HL104580 and CPC 5 R24 HD050924).