Occasionally eat no deterioration of the overnight meal generally does not have significant harm, but long-term consumption may increase the risk of cancer, in addition, if the overnight meal has deteriorated, consumption can cause gastrointestinal discomfort and other hazards. 1. Cancer-inducing: part of the overnight rice nitrite content exceeds the standard, increasing the risk of cancer in the long term. 2. Gastrointestinal discomfort: overnight rice will nourish a lot of bacteria, after consumption, gastrointestinal symptoms such as nausea, vomiting, abdominal pain, diarrhea and so on. To summarize, spoiled overnight rice can be harmful to the body and it is not recommended to consume spoiled overnight rice. Food should be consumed as soon as possible. When the above symptoms occur, you need to go to the hospital in time for examination and treatment.