Eggs are eggs laid by some land animals, and the embryos are covered with waterproof shells. Birds, reptiles, mammals, platypus and echidna all lay eggs. At a proper temperature, the eggs will hatch in a certain time, and the larvae will break out with the keratin above their mouths. Eggs are rich in nutrition and low in price. They can be made into stewed eggs, tea eggs, cakes and other delicacies, and have been regarded as the best source of nutritional supplements since ancient times. It's also a movie.
Eggs are eggs laid by some land animals. The embryo is covered with a waterproof shell, and the surface of this shell has many small holes. If the egg is washed with water, it won't hatch. Birds, reptiles and mammals all lay eggs, so do insects. An egg is an egg without a shell, and its outer layer is covered with a gelatinous substance, such as frog eggs or toad eggs. Generally, mammalian eggs are not excreted for fertilization, so they are called eggs. egg
At a proper temperature, the fertilized egg will hatch in a certain time, and the larva will break out with the keratin above the mouth. Most bird eggs are pear-shaped, that is, one end is pointed and the other end is big. This is to make the whole egg heat evenly when the parent bird hatches the egg, so as not to let the egg roll out of the nest and evolve into that shape, but to roll to the tip. Eggs have an air chamber at the end of the big head for oxygen exchange and easy breathing. So there are countless pores on the surface of eggs. Protein is as protective and stable as amniotic fluid, while yolk provides nutrition for embryo growth. Eggs are rich in protein, fat and vitamins, and are one of the important foods. Often eat eggs, duck eggs, pigeon eggs, quail eggs, etc. Can be made into steamed eggs, baked eggs, fried eggs, preserved eggs. Foods include egg tart, tempura, double-skin milk, preserved egg crisp, cake, egg drop soup, four-color eggs, preserved eggs, salted duck eggs and so on.
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egg
Eggs are one of the most important foods for human beings. Common eggs include eggs, duck eggs, goose eggs and quail eggs. , with almost the same nutritional composition and structure, of which eggs are the most common. Eggs are composed of eggshells, yolk, protein and egg tendons, and have the following nutritional values:
eggshell
Eggshell is rich in calcium carbonate, which is very easy to digest and absorb, and is the best source of calcium supplement. Under normal circumstances, grinding about 2 grams of eggshells into powder every day can prevent backache, easy fracture or osteoporosis caused by calcium deficiency and bone loss.
yolk
Egg yolk is rich in nutrients such as protein, fat, calcium, lecithin and iron. Lecithin can promote the elimination of cholesterol in blood vessels and prevent atherosclerosis after being absorbed by gastrointestinal tract. Moreover, after lecithin is digested and absorbed, it can produce choline, which is related to the nerve transmission function of the brain and can promote the ability of learning and memory, thus achieving the effect of preventing Alzheimer's disease. Choline can also prevent the liver from accumulating too much fat, avoid fatty liver and improve liver function. The iron contained in egg yolk has the highest utilization rate and is the most blood-enriching natural food.
albumen
Protein contains a kind of protein called albumin, which has the function of scavenging active oxygen, enhancing human immunity and preventing cancer. Moreover, after being decomposed by digestive enzymes, the ovalbumin in protein can produce lysozyme, which can activate macrophages, resist the invasion of foreign germs and improve the immunity of the body.
Egg lace
There are two white cords on the left and right sides of the yolk, namely the egg lacing, which is a part of protein and a source of high-quality protein. It also contains a component found in bird's nest, called sialic acid, which has antioxidant effect and can be combined with viruses invading human body, thus eliminating viruses, preventing infection and preventing cancer. In addition, China's ancient medical book Compendium of Materia Medica records that eggs are sweet and flat, which can calm the five internal organs and calm the nerves; It can stop convulsion and prevent miscarriage, and has the effects of nourishing yin, strengthening spleen and tonifying lung. , but also dry. If eaten regularly, it can eliminate illness and prolong life. It is most suitable for growing children, teenagers and pregnant women as nutritional supplements.
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cholesterol
egg
Eggs contain high cholesterol, which is considered to increase blood lipids and lead to arteriosclerosis, so it is generally known that people with coronary heart disease, hypertension, hyperlipidemia, high cholesterol and other diseases should not eat more eggs. However, some medical studies believe that egg yolk is rich in lecithin, which is a strong emulsifier, which can make cholesterol and fat particles smaller and suspended, and help lipids penetrate blood vessel walls and be absorbed and utilized by tissues, thus reducing cholesterol in blood. Therefore, the medical profession suggests that people who are already ill and need to limit cholesterol intake should control the intake of egg yolk under the guidance of dieticians. The general public, while eating eggs, must control the intake of animal fat and calories, eat more fruits and vegetables to avoid high cholesterol.