Can you eat watermelon the day after it has been cut open?

Watermelon can be consumed the next day, but continued consumption is not recommended.

Once cut open, watermelon should not be consumed the following day unless properly protected. When left uncovered at room temperature, cut watermelon undergoes oxidation—leading to changes in texture and flavor—and becomes susceptible to bacterial contamination. Consumption may cause gastrointestinal discomfort, including nausea, abdominal pain, and diarrhea; in severe cases, it may even result in food poisoning.

During summer, bacteria multiply rapidly. Even when stored in the refrigerator, cut watermelon is prone to bacterial contamination over time. Its high sugar content and rich nutritional profile further accelerate bacterial growth. Eating such contaminated watermelon may cause mild gastroenteritis—manifesting as abdominal pain and diarrhea—or, in severe cases, systemic toxicity.

If symptoms occur after consuming watermelon, prompt medical attention is essential. Treatment should be tailored based on clinical evaluation and diagnostic findings—for example, correcting electrolyte imbalances and maintaining intravascular volume.