The web-buffet--development and validation of an online tool to measure food choice.

Abstract:

OBJECTIVE:To date, no data exist on the agreement of food choice measured using an online tool with subsequent actual consumption. This needs to be shown before food choice, measured by means of an online tool, is used as a dependent variable to examine intake in the general population. DESIGN:A 'web-buffet' was developed to assess food choice. SETTING:Choice was measured as planned meal composition from photographic material; respondents chose preferred foods and proportions for a main meal (out of a possible 144 combinations) online and the validity was assessed by comparison of a meal composed from a web-buffet with actual food intake 24-48 h later. Furthermore, correlations of food preferences, energy needs and health interest with meals chosen from the web-buffet were analysed. SUBJECTS:Students: n 106 (Study I), n 32 (Study II). RESULTS:Meals chosen from the web-buffet (mean = 2998 kJ, SD = 471 kJ) agreed with actual consumption (rs = 0.63, P < 0.001) but were on average 367 kJ (10.5%) lower in energy than consumed meals (mean = 3480 kJ, SD = 755 kJ). Preferences were highly associated with chosen amounts and health interest was negatively correlated with the energy selected (rs = -0.40, P<0.001). CONCLUSIONS:Meal composition choice in the web-buffet agrees sufficiently well with actual intake to measure food choice as a dependent variable in online surveys. However, we found an average underestimation of subsequent consumption. High correlations of preferences with chosen amounts and an inverse association of health interest with total energy further indicate the validity of the tool. Applications in behavioural nutrition research are discussed.

journal_name

Public Health Nutr

journal_title

Public health nutrition

authors

Bucher T,Keller C

doi

10.1017/S1368980014002456

subject

Has Abstract

pub_date

2015-08-01 00:00:00

pages

1950-9

issue

11

eissn

1368-9800

issn

1475-2727

pii

S1368980014002456

journal_volume

18

pub_type

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