Preservatives are a class of food additives that can inhibit microbial activity and prevent food spoilage. To make food have a certain shelf life, it is necessary to use certain measures to prevent microbial infection and reproduction. Practice has shown that the use of preservatives is one of the most economical, effective and simple way to achieve the above purpose.

Preservatives in general will not affect the body, because we usually most commonly used food preservatives, one is potassium sorbate, another is sodium benzoate. Look at them, much like the sugar we usually eat.