Forms of peanut butter were widely introduced in 1904 at the Louisiana Purchase Exposition, although it had been sold as a medical nutritional supplement in St. Louis, Missouri for about 15 years. The modern, non-separating version was invented in 1922 by Joseph L. Rosefield, and became a popular lunch for schoolchildren. Peanut-butter-and-jelly sandwiches were first mentioned in print in 1940. Both peanut butter and jelly were packed with United States Army K-rations in World War II. The combination proved so popular that returning GIs made peanut butter and jelly a standard American food.
3 year old bread
Peanut butter and jelly has been available in the military instant food Meal, Ready-to-Eat (MRE) for many years. The sandwich can survive in the field for up to three years. A challenge in creating this longevity was finding a way of preventing the bread from spoiling.
These sandwiches take a form similar to the "sealed" sandwiches mentioned in the section below. The peanut butter and jelly are baked inside a dough covering, completely contained within.
A healthy option? Really?!!
It has been suggested that a peanut butter and jelly sandwich can be a delicious and nutritious option for the health-conscious consumer, even those looking to lose weight. Whole wheat bread, natural peanut butter without any added sugar or trans fats, and a natural jelly (or freshly mashed berries) will provide up to 5 g of fiber, a healthy dose of fruit and antioxidants, and the heart-healthy fats in the peanut butter help to lower the risk of heart disease. The whole wheat bread and peanut butter will slow digestion, making a person feel fuller, longer.
-- Wiki.
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