title: Adolescents in the United States can identify familiar foods at the time of consumption and when prompted with an image 14 h postprandial, but poorly estimate portions.
abstract: OBJECTIVE
  To evaluate adolescents' abilities to identify foods and estimate the portion size of foods consumed in order to inform development of the mobile telephone food record (mpFR).
  
  
  METHODS
  Data were collected from two samples of adolescents (11-18 years). Adolescents in sample 1 participated in one lunch (n 63) and fifty-five of the sixty-three adolescents (87 %) returned for breakfast the next morning. Sample 2 volunteers received all meals and snacks for a 24 h period. At mealtime, sample 1 participants were asked to write down the names of the foods. Sample 2 participants identified foods in an image of their meal 10-14 h postprandial. Adolescents in sample 2 also estimated portion sizes of their breakfast foods and snacks.
  
  
  RESULTS
  Sample 1 identified thirty of the thirty-eight food items correctly, and of the misidentified foods all were identified within the correct major food group. For sample 2, eleven of the thirteen food items were identified correctly 100 % of the time. Half of the breakfast and snack foods had at least one portion size estimate within 10 % of the true amount using a variety of measurement descriptors.
  
  
  CONCLUSIONS
  The results provide evidence that adolescents can correctly identify familiar foods and they can look at an image of their meal and identify the foods in the image up to 14·5 h postprandial. The results of the present study not only inform the development of the mpFR but also provide strong evidence of the use of digital images of eating occasions in research and clinical settings.
authors.affiliation: Department of Foods and Nutrition, Purdue University, 700 W State Street, West Lafayette, IN 47907-2059, USA.
authors.forename: TusaRebecca E
authors.initials: TE
authors.lastname: Schap
authors.forename: Bethany L
authors.initials: BL
authors.lastname: Six
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Delp
authors.forename: David S
authors.initials: DS
authors.lastname: Ebert
authors.forename: Deborah A
authors.initials: DA
authors.lastname: Kerr
authors.forename: Carol J
authors.initials: CJ
authors.lastname: Boushey
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D002648:Child; D015930:Diet Records; D004034:Diet Surveys / Q000295:instrumentation* / Q000379:methods*; D002149:Energy Intake; D005260:Female; D005502:Food / Q000145:classification*; D006801:Humans; D008297:Male; D015596:Nutrition Assessment; D010781:Photography; D019518:Postprandial Period; D013997:Time Factors; D014481:United States