After the leftovers are repeatedly heated or brewed with boiling water, the water-soluble vitamins such as B vitamins almost disappear, and most minerals are also lost, so it is easy to be malnourished after long-term consumption. The content of nitrite in leftovers will gradually increase with the storage time. After long-term consumption, it is easy to cause nitrite poisoning, with symptoms such as abdominal pain, diarrhea, dizziness and headache.
Improper preservation of leftovers can easily breed bacteria. Long-term consumption will lead to a large number of bacteria entering the gastrointestinal tract, increasing the risk of gastrointestinal diseases. It is not recommended to eat leftovers for a long time, but to cook on demand. In addition, when eating leftovers, be sure to fully heat them.