Pineapple can be eaten overnight if it is properly preserved, such as refrigerator properly refrigerated, and there is no deterioration, odor and other manifestations. Pineapple has some nutritional value, with about 10.8g of carbohydrates per 100g, as well as vitamins, minerals and other nutrients. However, if the pineapple is exposed to indoor temperature for a long time, placed in the air of the pineapple pulp is rich in sugar and other substances, overnight it is easy to microbial reproduction, and there is a change in food properties such as odor, it is not recommended to eat, so as not to induce gastrointestinal inflammation and other gastrointestinal discomfort after eating. In daily life, pay attention to the selection of fresh fruits, as soon as possible to eat in moderation. People who are allergic to pineapple are not allowed to eat, so as to avoid adverse reactions in the body.