A food preservative is a substance added to foods to make them last longer; to “preserve” them. Preservatives are added to foods to slow spoilage, and have found themselves in all kinds of products in our grocery stores.
Preservatives work to preserve food in a few different ways. Some prevent the growth of bacteria and mold. Others prevent delicate fats from going rancid.
There are so many preservatives out there. While preservatives added to foods should be “approved,” this doesn’t mean they’re guaranteed to be safe for everyone always. And it doesn’t mean that the food is healthy.
Read more at the source