Objective.- The year 2020 marks the 10th consecutive year of the ePINUT study which is used for promoting awareness of hospital malnutrition in paediatric wards. The present article describes the methods and the studied population.Materials and methods. - ePINUT is a cross-sectional study gathering data each year over 2 weeks in March. Any child up to 18 years old, hospitalized except in neonatal and intensive care units could be included in this study. Length of hospitalization, weight variations and height were measured. An online calculator was made available for nutritional indices (http://www.epinut.fr/), in accordance with the French Paediatric Society guidelines. A geographic grouping was done based on university inter-regions.Results. - A total of 13,332 entries in France were included from 2010 to 2019. On a geographic level, 6 of the 7 regions contributed yearly to 10 to 15% of these entries, while the western region accounted for 25% of the entries (P < 0.001). Ninety-two cities participated, with 36% participating 5 to 9 years, 39% participating 2 to 4 years, and 26% participating once. The median age was 4 years old, 10.2% of children had a Weight-for-Height z-score smaller than -2 at admittance. These children stayed longer in the hospital (8.3 +/- 11.3 vs. 6.4 +/- 9.3 days, P = 0.02) and had a greater percent weight change during hospitalization (2.8 +/- 4.7 vs. 0.4 +/- 3.8%, P < 0.0001).Conclusion. - Such a long-term promotion of awareness about hospital malnutrition is unique. The future aim is to empower young patients and their parents and to get them involved in reducing hospital malnutrition in children. (c) 2021 Societe francophone nutrition clinique et metabolisme (SFNCM).