Eggs that have been left for a long time can be eaten if they are not spoiled; if they are spoiled, they cannot be eaten. Generally speaking, eggs should not be left for a long time, otherwise they will be easily contaminated by Salmonella, Staphylococcus aureus, Escherichia coli and other bacteria, which may cause abdominal pain, diarrhea, nausea, vomiting, and other food poisoning symptoms after consumption. It is recommended to use eggs as soon as possible after purchase to avoid expiration. If they have been left for a long time and become rotten and smelly, or the appearance of the egg is cloudy, it is not recommended to consume them. Eggs are rich in nutrients, each 100 grams of white-skinned eggs contain about 138kcal, of which 1.5 grams of carbohydrates, 12.7 grams of proteins, 9 grams of fats, 48 milligrams of calcium and 2 milligrams of iron. Moderate consumption of eggs can provide the body with a variety of nutrients to maintain human health. It is best to keep eggs in the refrigerator after purchase and consume them as soon as possible. People who are allergic to eggs should avoid eating egg products.