Overnight Coffee: What Yesterday’s Iced Latte May Be Doing to Your Kidneys

The overnight coffee sitting in your refrigerator right now probably won’t hurt you. The one that spent an afternoon on a warm desk before it went into the refrigerator is a different question — and for a man in his early thirties in Taiwan, the difference between those two cups was the difference between an ordinary week and an emergency admission that came close to dialysis.

The afternoon that mattered

Dr. Hung Yung-hsiang, a Taiwanese nephrologist, described the case publicly in early August. The patient, whom he refers to as Mr. Chen, was thrifty in the ordinary way many people are: drinks he did not finish went into the refrigerator for the following day. Nothing about the habit is unusual. Most households run on some version of it.

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