Abstract
Household routines generate food waste piling up in Indonesia's waste stream, its largest single component, and neither policies nor technology has managed to reduce it. This article investigates how Islamic environmental ethics can be translated into behavioural terms specific enough to guide those routines, working as a literature-based conceptual study in which the Qur'an and the Hadith serve as primary textual sources while classical exegesis, fiqh literature, contemporary Islamic studies, and behavioural research on food waste function as interpretive and supporting material. These sources inform us about Islamic Food Waste Behaviour (IFWB), a framework of five operational principles: taḥdīd al-ḥājah (proportionality of need), taʿẓīm al-niʿmah (honouring the divine gift), iḥtirām al-luqmah (respect for the smallest portion), masʾūliyyah ijtimāʿiyyah (social responsibility), and taysīr al-qudrah (building practical capacity). Each principle is traced from a scriptural source, connected to the ethical categories of Islamic environmental ethics, tawḥīd, khilāfah, amānah, mīzān, and fiṭrah, and mapped onto the belief structures that the Theory of Planned Behaviour identifies behind attitude, subjective norm, and perceived behavioural control. The framework is then applied to Law No. 18 of 2008, Presidential Regulation No. 97 of 2017, and MUI Fatwa No. 47 of 2014, which set out obligations and targets while mentioning little about the conduct they presuppose. IFWB is offered here as a conceptual proposal requiring empirical testing, not as a validated model.