Twinkies are famous for being unhealthy (and delicious). They're also known for their long shelf life due to their many preservatives. If you're eating a Twinkie, it's not for the health benefits. But what is actually in a Twinkie? You might be surprised.
Apart from enriched flour, sugar, high fructose corn syrup, and partially hydrogenated oils, Twinkies also contain beef fat. Vegetarians beware! One Twinkie contains 2.5 grams of saturated fat, which is 13% of the daily recommended fat intake based on a 2,000 calorie per day diet.
Overall, a Twinkie is 42% sugars, 21% complex carbohydrates and 11% fat by weight. As far as the urban legend that claims that Twinkies can last months or even years on the shelf, this false. Although it does last longer than other types of food due to the preservatives and the way it is made.
A Twinkie can usually last 7-10 days on the shelf but can sometimes be safe for 25 days or more. Conclusion? You wouldn't want to stock your bomb shelter with them because not only would they not provide any nutritional benefit but they wouldn't last very long either.