The reason is that if the eggs are not completely cooked and the immature yolk is eaten overnight, nutritious things will easily breed bacteria and be harmful to the body, such as gastrointestinal discomfort and flatulence, if they are not properly preserved. However, if the food (eggs) is cooked and properly sealed at low temperature (usually refrigeration temperature), it can be preserved for 48 hours.

Fresh eggs are alive and need to breathe constantly through the pores on the eggshell, so they have the function of absorbing odor. If garlic, leek and other foods with peculiar smell are mixed during storage, the eggs will have peculiar smell, which will affect the eating effect. Therefore, when storing eggs, we should pay attention to isolation from other foods.

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Related links: Don't eat these eggs.

Cracked egg: this kind of egg is easy to be invaded by bacteria, and it is not suitable for eating after a long time.

Sticky shell egg: This kind of egg has a tough and weak yolk membrane due to long storage time, and the yolk is close to the eggshell. If it is red locally, it can be eaten, but if the egg membrane is close to the eggshell and the epidermis is dark black, it is not suitable for eating.

Yellow scattered eggs: The yolk membrane is broken due to violent vibration such as transportation, and the protein structure is destroyed by bacteria or mold invading the egg body through the pores of the eggshell, resulting in yellow scattered eggs, and the egg liquid is thin and turbid.

Rotten egg: Because bacteria invade and multiply in the egg, the eggshell turns dark gray, and even breaks due to the expansion of hydrogen sulfide gas inside, and it smells bad, so this kind of egg is inedible.

People's Daily Online-Beware: 8 deadly overnight foods: eggs and tremella soup!