What constitutes a living wage certainly varies from region to region or at least the perception of the wage earner does. A rice paddy farmer in Cambodia will have quite a different definition from a janitor in Manhattan USA.
As to how much food is enough I think it can be defined as the amount and variety that will maintain a stable and healthy body weight and prevents any nutrition caused diseases or declines in overall health.
So at the end of your year living off your stash you will be a year older but otherwise no worse off then you were before. That takes quality as well as quantity and many people in the poorer countries of the world chronically suffer from both a shortage of calories and of vitamins and other essential nutrients. They continue to survive at lower body weights but they age much faster then well nourished individuals and have higher death rates in spite of the advantage of not suffering from diabetes and heart disease.
So the target is somewhere between what the untouchable in Calcutta is eating and what is considered normal for the fast food inhaling Americans that are packing it away down at the all you can eat buffet