Over the past few decades, it has become possible to speak of a "global food system"—shorthand for the trade patterns, shaped by multinational companies, that move raw agriculture commodities and processed food across borders. Yet as this fascinating new Oxfam study shows, there are still huge differences in people's experience of food across the globe. Oxfam ranked nations on four criteria: whether food exists in plentiful supply, whether it's broadly affordable, whether it's of good quality, and whether it's causing high rates of obesity and diabetes.