Self-heating lunch box is generally harmless to the human body, if the use of improper operation, there may be adverse effects on health, so you need to master the correct operation method. Self-heating lunch box heating time is short, you can heat the food without the use of open flames, the heating package used in heating, in contact with water will produce high temperatures, able to cook the meal, will not be in direct contact with the meal, the vessel in the case of high temperature will not be released under the circumstances of the toxic substances, and therefore will not be hazardous to health. If the operation method is not appropriate, may be burned by the steam, in addition to the heating package may be an explosion, which will cause accidents, this time should immediately go to the emergency department of the hospital for treatment. It is recommended to master the correct method of use, but also to avoid too frequent use. In the purchase of self-heating lunch box, you need to buy products produced by regular manufacturers, you need to use the heating pack in accordance with the instructions, so as not to adversely affect the health of individuals.