... a Civil Defense cracker is the size and shape of a full shingle of Graham Cracker. It intentionally tastes like cardboard! Six crackers a day was the basic ration for an adult.That was only 700 calories per 24 hours with a goal of approx.10,000 calories, total stockpiled rations per person, during the course of a two week sheltering.
With the average healthy diet listed at 2,000 calories a day; we would have seen a much slimmer America emerging into the post-apocalypse landscape! Civil Defense plans really meant a bare subsistence diet. I have to wonder in what shape these survivors would be in to rebuild the world!
This must be one of the reasons that many Civil Defense instructions urge people to bring along non-perishable food to a public shelter. But no family pets allowed- unless they're part of the smorgasbord!
... it was common policy for government Survival Rations (specifically military) to 'have the taste appeal of a boiled potato'. This was to discourage there consumption in all but the life and death circumstances they were designed for.
... more on Civil defense rations here.