CHILDREN under four should not have slushy ice drinks because they can be toxic, food chiefs warn.
The Food Standards Agency said toddlers can suffer headaches and sickness due to high levels of the glycerol sweetener.
In the worst cases they could even faint or go into shock, the FSA warned.
It added that under-10s should be refused free refills to stop them drinking too much.
Adam Hardgrave, head of additives at the regulator, said: “The symptoms of glycerol intoxication are usually mild but it is important that parents are aware of the risks – particularly at high levels of consumption.