This study investigates the perceptions and behaviors related to sustainable food consumption among various demographic groups in northern Taiwan, focusing on the metropolitan areas of Taipei City and New Taipei City. The narratives of Taiwanese people practicing sustainable eating were analyzed by applying practice theory. Semi-structured interviews were conducted with 30 participants from diverse demographic backgrounds (e.g., university students, homemakers, professionals, and retirees). Their educational backgrounds and work experience were recorded. The research highlights the effects of urbanization on the food choices of consumers, highlighting challenges such as high costs, time constraints, and limited access to kitchen facilities among university students. High-income professionals and retirees exhibited a preference for organic and locally sourced foods, whereas middle-aged homemakers emphasized seasonality and support for small farmers. The crucial roles of information sources (e.g., online media and television) and various cultural factors (e.g., religious beliefs) in influencing sustainable food behaviors were also identified. Despite its regional focus, this study provides valuable insights and recommendations for policymakers that can support sustainable food consumption.