Kidney Patients Warned Against Shaved Ice, Emergency Dialysis Needed

Doctors are warning stage 4 chronic kidney disease patients about four serious risks associated with eating shaved ice to cool off in hot weather, which can lead to severe dehydration and acute kidney injury. A case involving a 65-year-old male patient with stage 4 chronic kidney disease, whose kidney function was only 20%, illustrates the danger: after consuming a bowl of shaved ice topped with red beans, peanuts, and taro balls drizzled with syrup while shopping at a market, he experienced unusual sourness, then severe abdominal pain, vomiting, and diarrhea that same night. His body became severely dehydrated, causing low blood pressure that reduced blood flow to his kidneys and triggered acute kidney injury, requiring emergency dialysis to save his life.

Dr. Hongs Yang-siang, a kidney disease specialist, explained that while healthy people with diarrhea from shaved ice typically recover within days, stage 4 kidney disease patients face much greater risks and should be cautious about four key concerns:

1. Bacterial infection: Hygiene standards vary widely among shaved ice vendors, and ice and equipment can harbor bacteria. If a kidney patient develops severe acute gastroenteritis with heavy diarrhea, the body rapidly loses fluids, reducing blood flow to the kidneys and causing rapid kidney function decline.

2. High potassium: Toppings such as red beans, mung beans, peanuts, and taro contain high potassium levels. If failing kidneys cannot efficiently excrete excess potassium, it accumulates and increases the risk of irregular heartbeat or even cardiac arrest.

3. High fructose and phosphorus: Dark brown sugar syrup, sweetened condensed milk, and thick fruit jams contain high levels of fructose and phosphorus. Excessive fructose harms kidney function, while excess phosphorus that cannot be excreted damages blood vessels and bones.

4. Pulmonary edema: Ice melts into water in the body, and for stage 4 kidney patients who must restrict fluid intake—especially those with heart disease—one bowl of shaved ice can add hundreds of milliliters of extra water, straining the heart and lungs and increasing the risk of fluid overload or pulmonary edema.

Dr. Hongs recommends that kidney patients seeking refreshment in hot weather suck on small ice cubes made from filtered and boiled water, which provides a cooling sensation while controlling water intake. If eating shaved ice outside the home, avoid toppings made from beans and legumes.