I actually like Walmart's Great Value equivalent of Spam better than the Armour brand, and it's cheaper. I always keep a can in my cupboard.
It is meat, and it is protein. I never cease to be amazed at how these food-storage programs (including those that seem to be oriented, at least implicitly, towards Mormon prepping) offer so, so many sugars and carbohydrates, and relatively little protein. Think --- how much cereal, macaroni, rice, pancake preparations, and so on, can you eat? For my sugar situation, that would be a nightmare. I eat protein and lots of it. In fact, my nurse-dietitian told me "you don't eat enough carbohydrate, you're making your body look for sugar in all that protein".
THIS IS VERY IMPORTANT!You can live the rest of your life without eating another carb/fruit/veg.
There are NO essential carbs.You cannot live without fat or protein.
We have been lied to for years.
When getting yourself ready for famine keep this in mind.
Make your storage pantry mainly stocked with PROTEINS and FATS.
Stock up on a closet full of canned meats/soups with protein.
Also, the best way to make them last longer is to alternate fasting and feasting.
Reduction of calories causes (ie eating one can a day) is NOT the way to go. It will make you sick and tired and lower your immunities.
Dr. Jason Fung is the fasting doctor that has cured diabetes and arthritis and other illnesses through autophagy from fasting and has loads of good info.
In any case, if you want to make your stored food last longer then go a day or two without eating anything. Then have a feast for a day or two.
Carbs will only make you more hungry and are not necessary for survival. (although it's not bad to supplement with them)