Abstract

Objectives The relationship between household income and dietary intake among older children and adults in Japan has been studied. However, few studies have examined the relationship in younger children, and we believe that this should be taken into consideration from early childhood to correct health disparities. In this study, we examined the relationship between family income and dietary food group intake, and investigated the adequacy of food intake based on the Japanese Food Guide Spinning Top for young children aged 3 to 6 years attending nursery school. The goal of this study was to obtain trends in food intake that can be used to improve poor dietary intake of young children caused by socioeconomic factors.Methods A dietary survey using the food weighing or recording method and a self-administered questionnaire on dietary status were conducted on two non-consecutive days, including weekdays and weekends, from October to December 2019 or 2020. The participants were 761 young children (423 boys and 338 girls) attending nursery schools in seven cities in Japan. Equivalent income was calculated from household income and the number of family members indicated in the dietary status survey. Intake of each food group and consistency with the Japanese Food Guide Spinning Top were compared in five quintiles.Results Compared to the low equivalent income group, the high equivalent income group showed a decreasing trend in cereal intake and an increasing trend in the intake of sugar and sweeteners, green and yellow vegetables, and dairy products. The percentage of the low-income group who did not meet the definition of adequate intake using the Japanese Food Guide Spinning Top was lower for meals that include cereals and grain products, and higher for meals that include meat and fish, vegetable, milk and dairy products, and fruits.Conclusion The lower income group had higher intake of cereals and lower intake of vegetables and fruits compared to the higher income group. This finding is similar to the results of studies in adults and older children. However, based on the Japanese Food Guide Spinning Top, >90% of young children have a diet that fall below the adequate intake of meals, including vegetable dishes and even on weekdays, which suggests a general vegetable deficiency in young children. Multifaceted support is required to address this concern, including measures to correct disparities of income and to ensure desirable nutrient intake in early childhood.

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