According to How It's All Made, Twinkies contain "wheat flour, sugar, corn syrup, niacin, water, high fructose corn syrup, eggs, and shortening," all of which are real ingredients that go bad. As Hostess President and CEO, William D. Toler, stated, "[The Twinkie’s] shelf life is 65 days from bake, and we guarantee 45 days to our customer."