A novel web-based 24-h dietary recall tool in line with the Nova food processing classification: description and evaluation.

Objective: This paper describes the first web-based self-completed 24-h recall designed to categorise food intake according to Nova groups - Nova24h - and its agreement with a reference tool in estimating the dietary relative contribution of the four Nova food groups (% of total energy intake).
Design: Comparisons of estimates of dietary relative contributions of Nova groups obtained by Nova24h and one standard interviewer-led 24-h recall.
Setting: Nationwide adult cohort study in Brazil.
Participants: The subjects were 186 participants of the NutriNet Brasil Cohort Study ( n 186).
Results: No statistically significant differences were observed between the Nova24h and the reference tool mean contributions of unprocessed or minimally processed foods (52·3 % v . 52·6 %), processed culinary ingredients (11·6 % v . 11·9 %), processed foods (17·1 % v . 14·7 %) and ultra-processed foods (19·0 % v . 20·9 %). Intraclass correlation coefficients between individual estimates obtained for each Nova group showed moderate to good agreement (0·54-0·78). Substantial or almost perfect agreement between the tools was seen regarding the ability to rank participants according to quintiles of contribution of each Nova group (PABAK 0·69-0·81).
Conclusions: Nova24h is a suitable tool for estimating the dietary relative energy contribution of Nova food groups in the NutriNet Brasil cohort. New studies are necessary to verify its adequacy in other populations.