By Abigail O’Leary Parents are being warned about giving their young children slushy drinks after two toddlers almost died from tasting the sugary drinks. Doctors have issued a warning over the popular drinks sold at playparks, cinemas and fairgrounds – blaming glycerol, an additive substance found inside the seemingly child-friendly drinks. The additive, also called E422, gives the drink its slushy effect, stopping the drinks from freezing solid and acts as a sugar-free sweetener. While mildly toxic to humans, the amount typically contained in slushies is so small that regular consumption pos…