What We Eat in America, NHANES 2007–2008: comparing day 1 and day 2 dietary data

Abstract

Dietary data for What We Eat in America, National Health and Nutrition Examination Survey 2007–2008 were analyzed to investigate differences in day 1 and day 2 intakes. USDA's Automated Multiple-Pass Method was used by trained interviewers to collect each 24hr dietary recall. The first interview was conducted in-person in the Mobile Exam Center, with 3-dimensional measuring guides available to help estimate food amounts. The second interview was by phone 3 to 10 days later using the USDA Food Model Booklet containing life-size drawings of the measuring guides. A sample of men (n = 2250) and women (n = 2433) 20 years of age and older with 2 complete days of dietary data was examined. Two-day dietary weights were used which adjust for day of the week. A comparison of energy intakes between days for men showed a difference between mean (±SEM) energy intakes of 2,473 ±34.5 kcal for day 1 and 2,352 ±37.7 kcal for day 2 (p<.01). The women reported consuming 1,773 ±25.4 kcal for day 1 and 1,738 ±26.3 kcal for day 2, which were not significantly different When the data were further analyzed by age group (20–39yr, 40–59yr, 60+yr), the mean energy intakes between days showed no differences for either gender (p<.01). Further results will be presented based on differences for the two 24-hour recalls beyond expected daily variation Funding source: ARS, USDA.