I would contend that most (if not all) “long shelf life” dehydrated/freeze dried food products fail to deliver the calorie and protein count that is required to survive. It is far more likely that you would have to double the quantity and cost to actually achieve any specified duration. If you don’t believe me, just examine the details in their advertising.
As someone who reads a lot on the internet, you have likely come across many authorities with “expert” advice on one topic or another. This is where the gray matter between your ears becomes the most important tool in your box of prepper skills. Think it through before you unilaterally apply someone’s expertise to your own situation. Let me repeat: this includes advice and suggestions from this website!
For a time in the 1970s, the terms survivalist and retreater were used interchangeably. While the term retreater eventually fell into disuse, many who subscribed to it saw retreating as the more rational approach to conflict-avoidance and remote "invisibility". Survivalism, on the other hand, tended to take on a more media-sensationalized, combative, "shoot-it-out-with-the-looters" image.
Label everything with the date of purchase. Sharpie pens were created for this purpose. However you choose to keep track, rotate your stored food items the best you can without getting paranoid about it. Many of the “use by” and “best by” dates on canned and packaged goods are put there by the manufacturer but relate more to taste and texture than actual spoilage. See the next item.
For global catastrophic risks the costs of food storage become impractical for most of the population  and for some such catastrophes conventional agriculture would not function due to the loss of a large fraction of sunlight (e.g. during nuclear winter or a supervolcano). In such situations, alternative food is necessary, which is converting natural gas and wood fiber to human edible food.
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The government of Prime Minister Theresa May dismisses such talk, but its own ministers have published contingency plans for an exit on March 29 without a deal, and for the first time since the end of rationing in the 1950s, Britain has a minister responsible for food supplies. More ominously, the government has advertised job openings in emergency planning.
What Jennifer, a self-described prepper who declined to share her last name for security reasons, didn’t anticipate was the sheer force of Maria’s rains and 155 mile per hour winds — and how little the storm shutters would do to protect her home. “I was taking water out of the bedrooms, the living rooms, the hallways,” she says. “The house was flooded.” At one point, a piece of debris flew off a neighbor’s roof and got stuck between the outside wall of Jennifer’s pantry and the storm shutters, ripping off a pair of windows in the process.
Ten months after the election, “Hillary For Prison” shirts have yet to go out of style, but what sells at any given show largely depends on what’s going on in the world that week. “I have noticed the radiation guys across from us this week,” says Mike Nocks, owner of Lebanon’s White Harvest Seed Company and one of the show’s guest speakers. “In years past, I haven’t seen much radiation stuff, but since the Korean guy has been doing more nuclear stuff, I’m seeing more interest in nuclear detectors.”
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It seemed important to know if this all-encompassing negativity was histrionic or appropriate — that is, if the hard-core Preppers I had met were crazy or were, in fact, on to something. Just before the show-and-tell, I came across a news report about Dr. Irwin Redlener, the director of the National Center for Disaster Preparedness at Columbia University, whom Gov. Andrew M. Cuomo had recently named to lead a commission investigating how ready the state was for another Hurricane Sandy-like emergency. I arranged an interview, figuring that he, if anyone, could answer my question.
Adam Hadhazy is a contributing writer for Live Science and Space.com. He often writes about physics, psychology, animal behavior and story topics in general that explore the blurring line between today's science fiction and tomorrow's science fact. Adam has a Master of Arts degree from the Arthur L. Carter Journalism Institute at New York University and a Bachelor of Arts degree from Boston College. When not squeezing in reruns of Star Trek, Adam likes hurling a Frisbee or dining on spicy food. You can check out more of his work at www.adamhadhazy.com.