From BBC News.

Children should completely avoid "slushy" ice drinks containing glycerol, which can make them very ill, until they are at least eight years old, according to a new study.

The researchers studied the cases of 21 two-to-seven-year-olds in the UK and Ireland who needed emergency treatment soon after drinking a slushy product.

The brightly coloured drinks are designed to appeal to children – but most contain the naturally occurring sweetener glycerol, instead of sugar, to stop them freezing solid and give the slushy effect.

If a young child drinks a slushy too quickly, glycerol intoxication could cause shock, hypoglycaemia (low blood sugar) and loss of consciousness.

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