If the date on your bread or snacks has expired, it does not mean they have not gone bad. In fact, once something goes stale it means that it has been depleted of moisture, which makes it less likely to grow mold. Try storing it in a plastic bag for extended shelf life.
Snack foods contain preservatives in order to maintain shelf life.
Different types of snacks have varying expiration dates: Potato chips will last one month after expiration date. Crackers and pretzels can last up to three months. One of the longest lasting snacks is popcorn, which has a shelf life of one to two years.
There is a myth that Twinkies can last upward of 50 years. However, this is urban legend. Twinkies can last for a lengthy 25 days without packaging, because dairy products are not a part of the recipe. After 25 days, a Twinkie does not spoil, but loses some of its taste and flavor.
Canned goods typically have an Expiration Date.
Low-acid canned foods such as vegetables like peas or carrots can last anywhere from two to five years. High acid canned foods such as citrus fruits, pickles, or tomatoes can last 12 to 18 months.