If an egg is 50g, China will produce more than 400 billion eggs a year.
It is one of the most familiar foods in China. You should add an egg to make cakes, pancakes, instant noodles and fried rice.
There are more varieties of eggs, and rumors about eggs have begun to fly all over the sky.
The most common egg, do you really understand?
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Six rumors about eggs
1. Are red-shelled eggs more nutritious than white-shelled eggs?
The ability to synthesize this pigment is mainly determined by genetic factors, so the color of eggshells under the same chicken is relatively fixed.
There are many kinds of chickens with white eggs, and they lay eggs quickly. But the number of chickens with red shell eggs is relatively small.
However, the main nutritional sources for people to eat eggs are egg white and yolk, which has little to do with the color of eggshells.
The price of red-shell eggs is naturally more expensive than that of white-shell eggs, because scarcity is more expensive, and the actual nutritional value of the two is not much different.
2. Earth eggs have higher nutritional value than ordinary eggs?
Native eggs refer to the eggs of free-range chickens in the free environment of farmers. This kind of native chicken eats whole grains and eats freely during the day.
Because the chicken is eaten by itself, the nutrition is not as balanced as the feed, so the eggs are small.
At the same time, native chickens eat a lot of green vegetables, and the content of carotenoids and vitamin B2 in egg yolk is high, so the color is dark.
On the market, a catty of ordinary eggs is 4-8 yuan, and a catty of native eggs can be sold to 16-20 yuan. In order to make more money, sellers usually talk about selling. 100 yuan a catty of sky-high eggs is very common.
Some unscrupulous merchants add pigment to feed, which makes the yolk of chicken black. Such "stained eggs" suddenly sold to the price of local eggs.
At present, the standards of the Ministry of Agriculture for eggs are only pollution-free eggs, green eggs and organic eggs standards, but there is no exact standard for native eggs.
The Expert Advisory Committee of the Nutrition Society of China made a comparative test between native eggs and common eggs, involving 17 amino acids.
They found that there was no significant difference between them, and there was no significant difference in nutrients such as protein, fat and microorganism.
Therefore, it is unfounded to say that native eggs are more nutritious than ordinary eggs.
Because the native chickens are free to eat, the chances of contact with pesticides, fertilizers, rodenticides, pesticides and other chemicals are greatly increased, and some toxic and harmful substances may remain in the eggs.
Without the inspection of the national authoritative organization, the hygienic problem of soil eggs cannot be guaranteed.
3. Is it healthier to eat only egg white and not egg yolk?
I don't know when it became popular to eat only egg whites and not egg yolks. Every day in the canteen, you can see the remaining egg yolk lying alone on the plate.
Many people don't eat egg yolk because they are worried about high cholesterol in eggs, but this is unnecessary.
According to the Dietary Guidelines for China Residents published on 20 16, the restriction on the daily intake of cholesterol was cancelled.
Cholesterol is not harmful, but a nutrient.
Cholesterol is a component of cell membrane and also contributes to the biosynthesis of some steroid hormones and cholic acid. Not eating foods containing cholesterol may cause nutritional imbalance.
Some people used to feed animals with foods lacking cholesterol, and as a result, the fragility of red blood cells in these animals increased, which easily caused cell rupture.
A 50g egg has a mass distribution of about 28.5g protein, yolk 16g and eggshell 5.5g.
According to China Food Composition Table (2002) issued by Nutrition and Food Safety Institute of China Center for Disease Control and Prevention, every 100g egg yolk contains 15 10 mg cholesterol.
The cholesterol content in egg yolk is about16 ÷100×1510 = 241.6 mg.
Normal people consume 300-500 mg of cholesterol every day, so the cholesterol in an egg will not exceed the daily cholesterol needed by the human body.
4. Can't soybean milk and eggs be eaten together?
Many people say that soybean milk and eggs can't be eaten together, because the trypsin inhibitor (aprotinin) in soybean milk will make protein unsuitable for absorption and greatly reduce the nutritional value of eggs.
This statement is based on the fact that the trypsin inhibitor in soybean milk is not destroyed, but only exists in raw soybean milk, so as long as the soybean milk is cooked and aprotinin loses its activity, it will not produce the result of "eating together".
In fact, soybean milk should be cooked before drinking, otherwise it may be poisoned. Soymilk machines on the market now generally cook automatically after pressing.
Eggs are a must for breakfast | vision china
So in practice, soybean milk and eggs can be eaten together.
5. Do women eat more eggs?
In China, giving birth to a child is regarded as a major event for the whole family, and the parturient is the key care object.
Pregnancy in the early stage and lactation in the later stage must ensure maternal nutrition, so it has become a traditional custom for pregnant women to eat a lot of eggs.
In the era of material shortage, maternal eating a lot of eggs can really supplement nutrition properly. But in today's extremely rich food, it is obviously unreasonable to eat a lot of eggs.
If you eat too many eggs, protein's catabolic products will increase, resulting in a heavier burden on the stomach. Two or three eggs a day, with meat, eggs, milk, beans, food and fruits and vegetables, is more conducive to the maternal diet balance.
6. Can eating raw eggs remove the fire?
Eating eggs raw can not only extinguish fire, but also endanger people's health.
The nutrition in raw eggs is not easily absorbed by the human body. After cooking, the molecular structure of protein changes, and it can become the protein absorbed by human body.
Raw eggs contain an antibiotic protein, which strongly hinders the absorption of biotin by human body.
Lack of biotin in human body can lead to loss of appetite, hair loss and other symptoms.
At the same time, fresh eggs may contain pathogenic salmonella, mold or parasitic eggs, which can be eliminated by boiling at high temperature.
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Eggs are the most natural tonic.
Eggs are natural supplements, rich in high-quality protein, easily absorbed by the human body and high in nutritional value.
Egg yolk is rich in lecithin, sterol, egg yolk, calcium, phosphorus, iron, vitamin A, vitamin D and B vitamins.
These ingredients have great benefits for improving the function of the nervous system, so eggs are better brain food.
20 14 Changchun April 10, college students sold rural eggs online through Weibo and WeChat, and accumulated their own business experience. Vision china
China's eating of eggs can be traced back to the period of the Yellow Emperor 6000 years ago. In Hanshu, eggs are called chickens; Shan Hai Jing calls it an egg.
"Compendium of Materia Medica" has detailed records on protein and yolk:
If the essence is insufficient, it is necessary to replenish qi, so egg white can clear qi and cure various diseases such as heat, red eyes and sore throat. If the shape is insufficient, it is supplemented by taste, so egg yolk can enrich blood and treat diarrhea and fetal diseases.
Did Jinling Edition of Compendium of Materia Medica in Ming Dynasty auction successfully? Vision china
In other words, egg white can burn fire and treat diseases such as burning eyes and sore throat. Egg yolk can replenish blood and treat diarrhea and various postpartum diseases.
Nowadays, with the Internet, online celebrity eggs have emerged, and they have negative value. Eggs can be colored, tomato sauce and floss can be added, and egg desserts can also be made into home-cooked dishes.
Of course, people eat eggs not only for delicious taste, but also for beauty and shaping.
Weight loss and muscle gain also need protein's supplement, so economical eggs have become the first choice for many bodybuilders.
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How to eat eggs nutritionally
The nutritional value of an egg lies not in the color of its shell, nor in whether its mother is a native chicken or an ordinary chicken, but in its freshness.
So, how to judge whether an egg is fresh? There are two common methods.
One is to put eggs in your ears. Fresh eggs can't hear the sound of water, but old eggs can hear the sound of water.
The second is to put the eggs into the water. Fresh eggs sink and old eggs float.
After buying fresh eggs, people should pay attention to their daily consumption. According to the Dietary Guidelines for China Residents (20 16), people should not eat more than seven eggs per week.
As far as the practice is concerned, cooking and steaming can best retain the nutrition in eggs, and the nutrient absorption rate and digestibility after eating are 100%.
If you change to other methods, the absorption rate and digestibility of eggs will be reduced to varying degrees.
For children, egg custard or egg soup is the most suitable. These two methods can decompose protein and be easily absorbed by children.
It was once thought that eating raw eggs directly without any processing is more nutritious than eating cooked eggs. In fact, the absorption rate and digestibility of raw eggs are very low.
And eating eggs raw is likely to lead to salmonella poisoning.
A survey conducted by the French Institute of Health and Epidemic Prevention found that more than half of the food poisoning incidents in France in recent years were caused by Salmonella.
In all salmonella food poisoning incidents, 60% are caused by eating raw eggs or undercooked eggs.
Many restaurants in Japan offer raw eggs, and it is a traditional Japanese food to mix raw eggs with soy sauce and bibimbap. But you should know that these raw eggs are mainly pasteurized eggs.
Pasteurization is a disinfection method that kills bacteria at low temperature while keeping the flavor of food unchanged.
Therefore, if you can't buy Pap eggs, don't blindly imitate those eating methods.
Besides, eggs have a nemesis.
Poached eggs in sugar water are very popular in many places, but in fact, when eggs meet sugar, amino acids in protein of eggs will form a combination of fructosyl lysine.
Although this way of eating is delicious, the nutrients are not easily absorbed by the human body and are easy to cause harm.
Eggs have a broad market in China, which can be said to be a major feature of China cuisine.
People in China always leave the taste of eggs on the tip of their tongue, so eggs must be eaten reasonably and healthily.
Knowing common sense about eggs can not only save you money, but also avoid many potential risks.
Then you can safely and boldly eat eggs. A beautiful day can really start with an egg that can be broken by blowing a bomb.
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[6] Wu Yisheng. Which kind of eggs with red and white shells are nutritious [J]. New countryside, 1997, (04):29
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[10] Lv Li, Ethan, Jingmeijiao, Ma, Li Lu 'an, Jin. Comparison of nutritional components among common eggs, native eggs and black-bone eggs [J]. Heilongjiang Animal Husbandry and Veterinary Department, 20 17, (17): 65438+.
[1 1] Ren Xiao. It is unscientific to eat eggs raw. Journal of Medicine and Health Care, March 3, 2008 (008)
Chen Yan, Liu Xiumei. Quantitative risk assessment of food-borne pathogens [J]. China Journal of Food Hygiene, 2008, (04):336-340.