Whether the preservative is harmful to the human body

Are they safe?Some studies suggest that benzoates,related to benzoic acid,contribute to hyperactive behavior.But the results aren't conclusive.Otherwise, these acids seem to be perfectly safe.Another antimicrobial strategy is to add a lot of sugar, like in jam,or salt, like in salted meats.Sugar and salt hold on to water that microbes need to grow and actually suck moisture out of any cells that may be hanging around,thus destroying them.