Having stable access to nutritious and culturally preferred food to maintain health and well-being is still a challenge for many people across the globe. Food insecurity and environmental degradation is rising across the world with interrelated drivers. There has been increasing advocacy for the creation of sustainable food systems to support food and nutritional security without degrading the environment. Bridging sustainability and food security ideas is a step towards building such food systems. However, how to apply ideas of sustainability and food security into building sustainable food systems remains a challenge, given the connection between the two concepts is not well appreciated. I introduce a sustainability and food security assessment framework as a first step for bridging sustainability and food security concepts, towards building sustainable food systems.