First, raw eggs contain anti-enzyme proteins and avidin. The former will hinder the contact between protease in human stomach and protein, and affect the digestion and absorption of protein. The latter can combine with biotin, which is not absorbed by the human body. But these two harmful substances, once destroyed by cooking or heating, will no longer affect the body's absorption of nutrients.

Secondly, the protein structure of raw eggs is very dense, and digestive enzymes in the gastrointestinal tract are difficult to contact and are not easily digested and absorbed by the human body. Cooked eggs have loose protein structure and are easily digested and absorbed by human body.

Finally, raw eggs may contain bacteria, viruses, parasites and so on. If it is not inactivated by cooking or heating, it may damage human health and lead to food poisoning and parasitic diseases.

Extended data:

Common ways to eat eggs

1, boiled eggs: eggs should be placed in a pot with cold water, heated with slow fire, boiled for another 3 minutes, and then soaked for another 5 minutes after the ceasefire. The eggs cooked in this way are tender, the yolk is not old, and protein has the best denaturation degree and is the easiest to digest. When eggs are boiled for more than 10 minute, not only will the taste get old, but also a lot of vitamins will be lost, and protein will become difficult to digest.

2. Boil poached eggs: Beat the eggs when the water is boiling, and turn to low heat to cook. Salted poached eggs can be added with tomatoes, vegetables and so on. And sweet can also add fermented grains, red dates, medlar and other ingredients.

3. custard: don't put oil or salt when stirring eggs, which will easily destroy the egg colloid and make the steamed custard thick and hard. Don't stir hard, stir several times, steam in the pot to ensure uniform stirring. In addition, adding a little milk to the steamed custard can make it taste smoother and more nutritious.

4, fried eggs: it is best to use small fire and less oil. Some people like to fry egg whites crispy, which will not only lose nutrition, but also produce carcinogens. It's best to fry only one side, the egg white will solidify.

5, spread eggs: use less oil, it is best to use medium fire. If the omelet is spread thicker, it will be more conducive to preserving nutrition.

6, scrambled eggs: it is best to use medium fire, avoid fire, otherwise it will lose a lot of nutrition, but also make the eggs hard. But the fire is too small, because after a long time, the water loses more, and the dried eggs will affect the texture.

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