Danish food firm Arla Foods has said that its functional sweetener, Gaio tagatose, is used in a new soft drink made by US beverages giant PepsiCo. PepsiCo is launching a Diet Pepsi-flavoured Slurpee, with Gaio tagatose as a taste enhancer. Gaio tagatose is produced from lactose, a residual product from cheese-making, Arla said.