Diet-related sustainability Sustainable dietsShifting towards sustainable diets is advocated as one of the strategies for sustainable life within the planetary boundaries. This shift contributes to mitigation of the adverse effects of our food production and consumption on the planet. Sustainable diets are defined by the FAO (2010) as "[those] diets which are nutritionally adequate, safe and healthy, while having a low environmental impact. These diets are also culturally acceptable, accessible, equitable, affordable, and economically fair, contributing to food and nutrition security and to healthy lifestyles for present and future generations." This definition demonstrates that dietary habits are shaped not only by individual or situational food choices, but also by citizens' food environment as part of the socio-cultural and economic context of the (trans)national food system (i.e. social and economic sustainability). 2009) defined nine different planetary boundaries, including climate change, ocean acidification, stratospheric ozone depletion, biogeochemical flow, global freshwater use, change in land use, biodiversity loss, atmospheric aerosol loading, and chemical pollution. All these planetary boundaries are related to the safe just space for humanity relative to the planet's system and to the planet's biophysical subsystems or processes (Rockström et al. 2009, Raworth 2017. These subsystems have tipping points. If these tipping points are exceeded, subsystems will acquire a new steady state, often with severe consequences for humans, such as deforestation and ice cap melting (Lenton et al. 2008). In order to estimate the impacts of our food production and consumption within these planetary boundaries, environmental sustainability indicators are used.
Rockström et al. (