Signs that eggs are not fresh

Eggs are foods that need to be kept fresh. In the hot summer, people usually put eggs in the refrigerator, otherwise the eggs may become stale. If the eggs are not fresh, it will greatly affect the taste and nutritional content. If the situation is serious, they may deteriorate and have adverse effects on the human body. So what are the signs that eggs are not fresh?

At a glance:

Look at the color of the eggshell, its cleanliness, whether there are cracks, etc. The shell of a fresh egg is complete and dull, with a layer of white powder on the surface, and it feels rough to the touch. Eggshells come in many colors, some are pink, some are yellowish, and some are green, but the nutritional value is actually similar.

Second flash:

When buying eggs, pinch the egg between your thumb, index finger and middle finger and shake it. If there is no sound, it is a fresh egg, and if there is a sound, it is a bad egg. If there is no sound, it means that the air chamber and yolk of the egg are intact; if there is a sound, it may be a stale egg.

Three Lights:

Hold the egg gently in your hand and observe it against the light. A good egg has clear white and yolk, which are translucent and have a small air chamber at one end. If the eggs are not fresh, they will be gray and have larger hollow spaces; old or spoiled eggs will have stains.

The following eggs cannot be eaten;

1. Cracked eggs: During the transportation, storage and packaging of eggs, due to vibration, squeezing and other reasons, some eggs may develop cracks and fissures, which are easily invaded by bacteria. If they are left for a long time, they are not suitable for consumption.

2. Sticky shell eggs: This type of egg has been stored for too long, and the yolk membrane has become weak, so the yolk is tightly attached to the eggshell. If it is partially red, it can still be eaten, but if the egg membrane is tightly attached to the eggshell and the outside of the skin is dark black and has an odor, it is not suitable to be eaten.

3. Rotten eggs: Because bacteria invade the eggs and multiply in large numbers, they become spoiled and the eggshell turns dark gray, or even ruptures due to the expansion of the internal hydrogen sulfide gas. The mixture inside the egg is gray-green or dark yellow and has a foul odor. These eggs cannot be eaten, otherwise it will cause bacterial food poisoning.

Nutritional value of eggs

1. Eggs are rich in protein, fat, vitamins, and minerals needed by the human body, such as iron, calcium, and potassium. The protein is high-quality protein and can repair liver tissue damage;

2. Rich in DHA, lecithin and yolk, it is beneficial to the nervous system and physical development, can improve brain function, memory, and promote liver cell regeneration;

3. Eggs contain more vitamin B and other trace elements, which can decompose and oxidize carcinogens in the human body and have anti-cancer effects.