"Benzoate" refers to a type of chemical compound derived from benzoic acid. It is commonly used as a preservative in food and beverages to maintain their freshness and prevent the growth of bacteria and fungi. Full definition
Research has found that artificial colours and sodium benzoate preservative in the diet can result in increased hyperactivity. (drcolinobrien.ca)
Agreed, I have stopped drinking diet sodas, not because of the reasons stated above, but because Sodium and Potassium Benzoate in the presence of vitamin C (ascorbic acid) and sunlight can produce benzene, a known carcinogen. (marksdailyapple.com)