After the watermelon has been cut for a long time, a film is formed on the surface of the pulp, and the cold air is gradually absorbed by the pulp.
When eating this watermelon, the salivary gland, tongue taste nerve and periodontal nerve in the mouth will be paralyzed by cold stimulation, which will not only make it difficult to taste the sweetness of watermelon, but also hurt the spleen and stomach and cause pharyngitis. Children eating frozen watermelon can also cause anorexia, abdominal pain, vomiting, diarrhea and so on. Therefore, frozen watermelons should be avoided.