Overnight Latte Nearly Causes Dialysis for 30-Year-Old Man; Doctor Reveals Hidden Dangers

A 30-year-old man's habit of drinking leftover coffee nearly led to kidney failure, underscoring the hidden dangers of consuming "overnight" beverages. The man, who had chronic kidney disease, experienced severe vomiting, diarrhea, and dehydration after drinking a latte that had been stored overnight. His condition rapidly deteriorated, causing acute kidney injury and dangerously high toxin levels, necessitating emergency treatment.

Dr. Hung Yung-hsiang, director of Hung Yung-hsiang Clinic, explained that while fresh coffee itself is not harmful and may even reduce the risk of acute kidney injury, "overnight" coffee poses significant threats. The primary culprits are pathogenic bacteria and mycotoxins that can proliferate in beverages left unrefrigerated or improperly stored.

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Coffee itself does not harm the kidneys, but once it becomes 'overnight' coffee, three hidden dangers can turn this kidney-protective partner into a kidney-damaging killer.

One major risk is bacterial contamination. Coffee that has been in contact with saliva can harbor oral bacteria. If left at room temperature for over two hours, these bacteria can multiply rapidly, especially in the presence of proteins and sugars. Consuming such contaminated coffee can lead to severe gastroenteritis, causing dehydration that can trigger acute kidney failure, particularly in individuals with pre-existing kidney conditions.

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If you drink spoiled overnight coffee, it can cause severe acute gastroenteritis, leading to vomiting and diarrhea, which rapidly causes dehydration and triggers dehydration-induced acute kidney failure.

For milk-based drinks like lattes, the risk is amplified. Fresh milk spoils much faster at room temperature, and even refrigeration doesn't eliminate all harmful bacteria. Furthermore, improperly stored coffee beans or grounds can develop Ochratoxin A, a potent kidney toxin that is not destroyed by heat. Long-term accumulation of this toxin can cause irreversible kidney damage.

To mitigate these risks, Dr. Hung advises drinking coffee immediately after brewing, ideally within one hour. Any coffee left out for more than two hours or overnight should be discarded. He also recommends prioritizing black coffee over milk-based options, as the latter are more prone to spoilage and higher in phosphorus and potassium. Proper storage of coffee beans in airtight, dark containers is also crucial to prevent moisture and mold growth.

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Brew and drink immediately, never leave it overnight.