Colorful slushie drinks, a favorite among kids and adults, are now under scrutiny as researchers warn they may be unsafe for children under eight. Experts caution that these beverages can trigger a toxic syndrome, causing symptoms such as loss of consciousness and a sudden drop in blood sugar levels.
A recent study examined 21 cases of children who became seriously ill after consuming glycerol-containing slushies. All were diagnosed with glycerol intoxication syndrome. Glycerol, a naturally occurring alcohol, is widely used as a solvent, sweetener, and ingredient in medications. In slushies, it helps maintain their semi-liquid texture by lowering the freezing point of water.
Researchers reviewed medical records of cases treated in emergency care between 2018 and 2024 across the U.S. The patients, aged two to seven, developed symptoms—most commonly loss of consciousness—within an hour of drinking a slushie. Four required brain scans, and one experienced a seizure. Other symptoms included hypoglycemia (low blood sugar), lactic acidosis (acid buildup due to excess lactate), and hypokalemia (low potassium levels). All patients recovered after treatment and were advised to avoid slushies.
The study highlighted concerns about the lack of transparency in slushie ingredient lists. While many brands disclose their ingredients, the exact glycerol concentration is often unclear. This raises safety concerns, as even minor dosing or mixing errors could lead to unexpectedly high glycerol levels, potentially causing adverse effects.
“There is poor transparency around slush ice drink glycerol concentration; estimating a safe dose is therefore not easy. It is also likely that speed and dose of ingestion, as well as factors such as consuming the drink on an empty stomach, after intense exercise, or alongside a meal, may contribute to its effects,” the researchers noted.
Based on their findings, researchers are urging clinicians and parents to recognize the risks. They also call on public health authorities to provide clear guidance. Experts emphasize that younger children, particularly those under eight, should avoid glycerol-containing slushies.