Woman eats leftover pasta after heating it in microwave, admitted in ICU after blood pressure drops dangerously low. Doctor explains what went wrong

A seemingly harmless plate of leftover pasta has sparked a viral warning from doctors after a social media discussion highlighted how reheated food can turn into a medical emergency.

Dr. Priyam Bordoloi shared the scenario of a student who found pasta left on the kitchen counter overnight, reheated it in the microwave until it was steaming hot, and ate it without a second thought. Within hours, the student began violently vomiting. By midnight, the severe fluid loss had caused a dangerous drop in blood pressure, leading to an ICU admission.

"So, what went wrong?" the doctor asked before explaining that the culprit was not the reheated pasta itself but a toxin that can survive even after microwaving.


Drawing from his roots in Assam, Bordoloi contrasted the incident with the traditional practice of eating Poita Bhat—rice soaked in water and left to ferment overnight. According to him, the fermentation process produces lactic acid, significantly lowering the pH and creating an environment where Bacillus cereus cannot survive or produce its toxin.

He then cautioned that people who routinely leave cooked rice or pasta sitting out at room temperature are "playing Russian roulette." The bacteria's spores, if already present in the uncooked food, can multiply rapidly when cooked food is left unrefrigerated for hours.

Bordoloi stressed that the illness is far more severe than ordinary food poisoning. He said the vomiting can be so intense and sudden that the massive loss of fluids causes blood pressure to crash before patients even realise what is happening.

The biggest danger, he added, is that the toxin produced by Bacillus cereus—known as cereulide—is heat-stable. That means microwaving leftovers may kill the bacteria but not the toxin already present in the food. As a result, people may unknowingly consume what he described as "hot toxin."

Another physician, Dr. M. Shujat Rasool, weighed in on the discussion, saying the symptoms matched classic Bacillus cereus emetic toxin poisoning. He explained that leaving pasta out overnight gives bacterial spores enough time to produce cereulide, which survives reheating. "Microwaving kills the bacteria but does nothing to the toxin, so violent vomiting and hypotension from all the fluid loss can occur," he said, advising people to refrigerate leftovers as soon as possible.

Responding to Rasool, Bordoloi pointed out that diagnosing such cases is not always straightforward. He said patients often blame the last meal they had at a restaurant rather than admitting they ate home-cooked pasta that had been sitting on the countertop for a day or two. According to him, getting an accurate food history is often "half the battle" in identifying the real cause.