A cross-over study comparing an online versus a paper 7-day food record: focus on total water intake data and participant’s perception of the records

Purpose To compare (1) fluid, food and nutrient intake obtained with a paper versus an online version of a 7-day food record and (2) user’s acceptability of both versions of the food record. Methods A cross-over study was carried out in 2010 in France. A total of 246 participants aged 18–60 years reported their food and fluid intake using both versions of the 7-day food record, separated by a 7- to 14-day washout period. To help participants in estimating consumed portions, both versions of the food record were supported by a photographic booklet of standard portions and containers. At the end of the study protocol, participants completed a questionnaire designed to assess the acceptability of the two questionnaires. Results The reported water intake of fluids was significantly higher with the online version compared with the paper version (respectively 1348 ± 36 and 1219 ± 34 mL/day, p