Whether watermelon can be eaten overnight should be decided according to the storage method of watermelon, storage time and other factors, if the watermelon is opened and placed at room temperature, it is not recommended to eat. Watermelon is a seasonal summer fruit that is sweet and delicious, and has the effect of cooling down the summer heat. Watermelon is rich in vitamins, water, glucose, potassium, lycopene and other nutrients. Each 100 grams of watermelon contains 26 calories, of which 5.8 grams of carbohydrates, 0.1 grams of fat, 0.6 grams of protein, 0.3 grams of dietary fiber, vitamin A 75 micrograms, potassium 87 milligrams, calcium 8 milligrams. Generally speaking, whether overnight watermelon can be eaten or not has a lot to do with the way it is preserved. Summer weather is hot, it is easier to breed bacteria, watermelon stored at room temperature is easy to breed bacteria, when breeding bacteria can not be eaten. If wrapped in plastic wrap and kept in the refrigerator, the storage time will be relatively longer and can be eaten, but it is generally not recommended to eat overnight food. Eating watermelon that harbors a lot of bacteria may cause the eater to experience abdominal pain and diarrhea, or even lead to food poisoning. So it is recommended to try not to eat overnight watermelon, when eating watermelon when the above symptoms, you should also be timely to the hospital checkup, do not be careless to miss the best treatment time.