Grains store better than most any other food. People overlook the value of that in a world of modern food preservation means. But intact grains can store for 20 years if kept dry and free of pests. Meat, vegetables, and dairy have to be chilled, frozen, smoked, canned, fermented, ect. Although eating grains alone is a poor diet, grains are the foundation for society because they provide caloric security in times of famine.