Costco has an online special of a 1 year emergency food supply for one person for $1199.99, made by Shelf Reliance. Incredibly that’s only 13 cents per serving. Some of the items have a shelf life of 25 years! At 1865 calories per day, many of patients would lose some weight.
Realistically, most people would not voluntarily eat only this for a year unless it was an emergency. I certainly would rather spend a year blogging and working my way through Mastering the Art of French Cooking.
It does show that it’s possible to subsist on a pretty low food budget (the cost of cooking and cleaning is extra). In fact one could make some substitutions, such as brown rice in place of white, to make it healthier, and add more variety supplementing with some fresh produce (or growing it in one’s yard), and add in some chicken or fish once or twice a week in place of some the less healthy items. Bon Appétit!