Food systems large and small around this planet are changing more quickly and more profoundly than ever before in human history. If the same processes and priorities continue, we can expect more of the same results: the last fifty years of a productionist paradigm have resulted in increased production of a small set of calorie-dense crops, increased calorie availability, and increased global homogeneity of diets, while environmental sustainability, human health, and equity issues remain unresolved. Food system sustainability is