If the water in the heating pack overflows into the food, it is best not to eat it. Usually the ingredients in the heating pack mainly include sodium carbonate, iron powder, activated carbon, quicklime and other chemicals, these substances undergo a chemical reaction to generate heat, so when heated the water in the heating pack may also be contaminated with these substances, which can be harmful to the human body after consumption. The water in the heating pack is not pure water that can be directly consumed, if the water overflows into the food, it will make the food have certain toxicity, and may cause gastrointestinal disorders and indigestion after accidental ingestion, and in serious cases, it may lead to food poisoning that causes abdominal pain, diarrhea, nausea, vomiting and other symptoms. Therefore, for safety reasons, it is not recommended to consume the food if the water in the heating pack overflows into the food. If you accidentally consume the food and experience the symptoms mentioned above, it is recommended that you go to the hospital as soon as possible for examination and treatment.