Generally speaking, the more a food is processed, the worse it is for long-term storage. You can make a fairly nutritious diet out of grains, beans and canned goods.
Properly packaged for storage, these foods will keep for years, and still be as tasty and nutritious when you take them out; as they were the day you bought them.
Therefore, you’ll have to repackage most of what you buy, in order to prevent spoilage.
However, even with repackaging, not all foods will keep well for long periods of time.
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