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Background  Todays, due to the impact of human food choices on increasing greenhouse gas emissions, water consumption and environmental degradation, there is a new approach about changing the pattern of food production and consumption, including sustainable food and nutrition system related to consumption. This study aimed to explore the components of a sustainable diet among the factors that affect people’s food choices.    Methods  This qualitative study was carried out using an in-depth interview with 33 individuals aged 30–64 years old living in different areas of Tehran. Data collection, data analysis and theoretical conceptualization were performed simultaneously. MAXQDA 10 software was used for managing and organizing the data.    Results  In this paper, the findings are categorized according to the key components of a sustainable diet in five themes: “Health and Nutrition”, “Food and Agriculture Security”, “Environment and Ecosystems”, “Markets, food trade and production chains”, “social, cultural, and policy factors” were categorized. Meanwhile, the components of the “Health and Nutrition” domain had the highest contribution and the components of the two domains “food and agriculture” and “environment and ecosystems” had the lowest role based on the participants’ perception in this study.    Conclusion  Considering to the low importance of the components of a sustainable diet in food choices of the community, promoting the individual awareness of sustainable diet components, clarifying the importance of food choices in creating environmental impacts and leading the national macro policies in the field food and nutrition toward sustainable diet goals are essential.    Supplementary Information  The online version contains supplementary material available at 10.1186/s40795-021-00459-7.

Exploring adults’ motives for food choice of sustainable diet components: a qualitative study in Tehran Metropolis