Can watermelon be eaten overnight?
May 09, 2025
Source: Cainiu Health
Dr. Yang Ziqi
Introduction
Under normal circumstances, as long as it has been properly stored and has not spoiled, leftover watermelon from the previous day is safe to eat; however, if improperly stored or already spoiled, it is not recommended for consumption. For health reasons, a thorough inspection should be conducted before consuming any leftover food to ensure its freshness and safety. Particular caution should be exercised with fruits like watermelon that have high water content.
Generally speaking, as long as it has been properly stored and shows no signs of spoilage, leftover watermelon from the previous day is safe to eat. However, if improperly stored or already spoiled, it is not recommended for consumption. Detailed analysis is as follows:
If the watermelon is immediately wrapped tightly with plastic wrap after being cut and stored in the refrigerator at around 4°C, bacterial growth can be effectively inhibited and the spoilage process slowed. Under such storage conditions, leftover watermelon from the previous day is usually safe for consumption. However, if the watermelon was not sealed with plastic wrap or stored in an airtight container and was instead left exposed to air or kept at room temperature—especially during hot summer weather—it may have spoiled and should not be consumed.
If the watermelon shows signs of spots, softening, emits an unusual odor, or tastes unpleasant when tasted, it has likely spoiled. Consuming such watermelon may cause gastrointestinal discomfort, such as abdominal pain, diarrhea, or vomiting. For individuals with weaker immune systems, such as the elderly, children, and pregnant women, consuming leftover watermelon that may be contaminated could increase the risk of infection, so extra caution is advised.
To safeguard health, thorough inspection should be conducted before consuming any leftover food to ensure freshness and safety. Particular care should be taken with fruits like watermelon that have a high water content. It is best to consume cut watermelon promptly or refrigerate it immediately. If any discomfort occurs after consumption, prompt medical attention is recommended.
