My husband’s family was Mormon back to the 1700s. Originally, they were told to have a 2 year supply of food. The government eventually took issue with that. It was negotiated that the church would back it down to a one year supply. They buy what they eat and rotate stock. For example, I don’t have a year’s worth of Marmite/Vegemite because no one here would eat it. I do have some Spam for in a pinch, having lived in Hawaii. Growing up in the Midwest, living through bad snow storms, tornadoes, etc., we’d lose power for days. I’m not an Apocalypse prepper, but I do have a very well stocked pantry. I buy what we eat and rotate so that the earliest bought can is used first. It just seems like common sense to me.
Mormonism wasn’t invented till the 19th century.