What are the common varieties of eggs, and how nutritious are they?
Eggs are rich in protein, and the amino acid ratio of that protein best matches the physiological needs of the human body, with a utilization rate of over 98%, making them very easy for the human body to absorb. For this reason, eggs are hailed as a "complete nutrition" food. Most people eat an egg every morning to supplement nutrition, and it is not hard to see that there are quite a lot of egg varieties on the market. So what are the common varieties of eggs? How nutritious are they?
1. Red-shell eggs
Red-shell eggs are the ordinary eggs usually sold in supermarkets and markets, generally produced by chicken farms. As long as some things are added to the chickens' feed, the color of the eggshell surface can turn red. They contain nutrients such as protein, fat and vitamins, and can supplement the human body's energy, among other things.
2. Free-range eggs
Free-range chickens are raised completely free-range, moving around outside every day and finding their own food. The eggs laid by such chickens are free-range eggs. Free-range eggs are small in size, but the yolk is larger and darker in color, and their content of carotene, vitamin B2, cholesterol and fat is relatively high. Because cholesterol is a main component of cell membranes and a precursor of steroid hormones, vitamin D and bile acids, with extremely important physiological functions, they are more suitable for children to eat.
3. Commercial eggs
Commercial eggs are eggs laid by caged chickens, which eat only feed, but the feed is specially formulated and contains a variety of nutrients, so the nutrition of commercial eggs is not inferior to that of the previous two kinds of eggs, yet their price is the cheapest. The cholesterol and fat content in the yolk of commercial eggs is far lower than that of free-range eggs, so they are more suitable for elderly people to eat. In addition, eating 1 egg yolk per day will not cause blood lipids to rise, so for friends with high blood lipids, high blood pressure or coronary heart disease, eating commercial eggs is more suitable and more economical.
4. White-shell eggs
Whether white-shell eggs or red-shell eggs, their main nutrients are protein, fat, vitamins and so on. Food experts say that although different varieties differ in some trace elements, the differences are small, and there is no need to emphasize the color difference when buying eggs.
5. Green-shell eggs
The color of the eggshell mainly depends on the breed of chicken and has little to do with what they eat. Green-shell eggs are eggs laid by silkie chickens or special breeds of chickens. The proportion of yolk is also larger than that of ordinary eggs, and the egg white is more viscous. Their nutritional value is slightly higher than that of ordinary eggs, and the price is also slightly more expensive.
In summary, these are the five kinds of eggs commonly seen on the market. In fact, the above five common eggs do not differ much in nutrition; it is just that green-shell eggs are more expensive than the other eggs. So which kind of egg do you like to eat?
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