There are two terms that Abbie and I frequently use when we're talking about actually eating your food storage: "rotating", and "living off of" it.
If you are living off of your food storage, it means that (for any number of reasons), you are relying primarily on your food storage to feed your family. We've known many people who have done this - heck, Abbie and I have even had points in our lives where we were feeding our family off our food storage, whether it was for a week or two or whatever. There are many reasons why you might live off your food storage - budget constraints, illness, job loss, etc.
When Abbie and I talk about rotating your food storage, we mean that we're using food storage items in our day-to-day living in order to keep them from going bad. Abbie and I each try to make 1 complete food storage meal per week (see our recipes page) so that we can be sure our food storage isn't just sitting in the closet collecting dust or expiring. Making one food storage meal per week also helps our families get used to eating meals like that, so if we ever did need to live off of our food storage alone, it wouldn't be as if we were introducing brand new foods to everyone.
You can also rotate your food storage without making completely non-perishable meals like we do. In fact, I'm constantly rotating my food storage without even really trying; every time I grab a can of beans or tomato sauce, it's coming from my food storage closet. I simply keep track of what I take out, and then next time I visit the grocery store I replace what we ate so that my supply is always up to date.
And one last thing about rotating: when Abbie and I each make our once-a-week food storage meal, we don't necessarily stick to just non-perishables. For example, when I'm using my beans to make Refried Beans, I don't serve only tacos and refried beans with salsa and olives, etc (all non-perishables). We add cheese and sour cream and lettuce and other non-perishables, because we can! Of course, we won't have these items if we had to truly live off our food storage 100% (because I won't be visiting the grocery store to get these fresh items), but there's no problem using them if you're just trying rotate through your food. The meal is still delicious without these foods, but it's fun to be creative and also just mix it up a bit.