- Listeria risk does increase if there is presence of the organism on certain foods. Manufacturers go to great lengths to control Listeria, but if a single organism gets onto the product, like a sliced deli meat, that risk increases the longer the product is held.
- Mold - the risk of mold growth increases in products that are drier in nature, breads or cheeses for example, as well as produce. Many molds produce mycotoxins, which can be really harmful. And people can have allergic reactions to food with mold present.
- Acid foods in cans can leach tin into the food - as acid foods go beyond the stated date, that will eventually deteriorate the can and with that, tin can leach into the product. High levels of tin are not healthy. Further, that acid will eventually cause the container to leak.
- Oxidized fat - In foods with fats/oils, such as potato chips, the oils will go rancid as product gets beyond the stated shelf-life..that is really the limiting factor that determine shelf-life. Oil breakdown products due to rancidity are extremely unhealthy over the long term (Link). If the level of rancidity is high, it can cause gastro-intestinal distress (link)
- And high levels of spoilage bacteria are going to produce a number of byproducts that can cause gastrointestinal distress. Much of that is determined by not only the number of organisms but the type or organisms present. In milk for example, homofermentive lactic acid bacteria with lactic acid as the primary byproduct is one thing, but if spoilage is due to gram-negative spoilage organisms, this is a different thing. We do not have control over what organism decides to spoil our food.
Unfortunately, for many reading this article, the main takeaway will be that they can and probably should eat expired food regardless of what it is or how far past the date it is. The need to for standardized terminology and understanding that terminology gets lost with narrative of someone eating expired food for a year.
Our focus should be on using food when it is at its best....that means consumers should, in some cases, buy less. In other cases, rotate their inventory. Eating expired foods is not really a good idea.
Unfortunately we are going to hear...go ahead and eat it, that goof ate expired foods for a year and was fine, you can just wash off that spoiled slice of bologna...are you kidding me? (And Jared ate subs for a year and look what happened to him....just kidding.)
Washington Post
https://www.washingtonpost.com/business/2019/06/17/this-man-ate-expired-food-year-heres-why-expiration-dates-are-practically-meaningless/?utm_term=.2d9486350125
Business
This man ate ‘expired’ food for a year. Here’s why expiration dates are practically meaningless.