Italy, one of the most involved countries in organic farming, represents a European case in the Mediterranean area concerning the sustainable food market, mainly based on organic food. The aim of this study is to investigate the theory of planned behaviour extended to past behaviour with particular attention to social pressure, in the context of sustainable food products across Italy. Data were collected on a regional basis and across different age classes and analyzed using structural equation modelling for a representative sample of approximately 3000 self‐reporting respondents who account for a remarkable percentage (69%) of sustainable food products purchasing. The strongest intention to buy these products was found in Northern and Central Italy while the South and the Insular macro‐regions exhibited the highest perceived purchasing barriers. The complexity of social pressure in predicting the intention to buy highlighted a clear and significant role of the Italian family in making sustainable food choices. However, the other social referent others, such as important people, friends, society, differentiated their contribution to these choices at territorial level. An exception to this latter trend was found for the society concept that completely failed its support as subjective norm predictor of intention. This may possibly be due to the fact that no sustainable food market policy is univocally identified in Italy, not even with legal certification unless it regards the organic sector. Nevertheless, past rewarding purchasing experience seemed to be the most effective motivation for buying sustainable food products in Italy. In conclusion, efforts both from the supply chain and political side should be made mainly in terms of rewarding purchasing experience and legal certification on sustainable food products.