Enras said: protein is the foundation of life. Without protein, there would be no life. There is a similar famous saying: Life is the living protein, and growth is the process of protein's accumulation.
If you still can't understand its importance,
Let's make an analogy. Calcium is the most popular concept in China. You will know that the main component of your bones and teeth is calcium, and you can personally feel the existence of calcium. Then guess, an adult weighing 100 Jin has about 750 grams to 1000 grams of calcium in his body, that is, one and a half to two Jin. As for protein, we usually don't feel it easily, but the dry weight can reach about 16 kg to 19 kg.
Your muscles, blood, internal organs, skin, bones and other organs all need the participation of this magical substance.
Therefore, protein's greatest function is to form body tissues. This is especially important for growing children, pregnant women and people who need to repair their bodies.
Fertilized egg to baby
The growth of minors
Necessity of gaining weight for pregnant women
So these people need to set up new organizations.
Wound healing
The life span of red blood cells is 120 days.
About 30 skin cells will age and fall off.
Gastrointestinal cells will be renewed within 3-4 days.
The renewal of the organization also needs protein's participation.
At the same time, protein can also regulate physiological functions, for example, nucleoprotein forms nuclei to affect cell functions, casein promotes food digestion, immune protein maintains immunity, myosin regulates muscle contraction, transferrin transports iron, hemoglobin carries oxygen, and albumin regulates osmotic pressure, so each protein plays an important role in regulating physiological functions.
We all know that protein also produces nutrients, but supplying energy belongs to its secondary function. In maternal and infant stores, we often hear that whole protein milk powder, moderately hydrolyzed milk powder, deeply hydrolyzed milk powder and amino acid milk powder are actually classified according to the size of protein.
Because the basic unit of protein is amino acid,
If it is difficult for you to understand, I will give you a chestnut. This necklace belongs to protein.
This grain is an amino acid.
Is it easy to understand now?
Different milk powders, namely protein, have different degrees of hydrolysis.
In nutrition, we divide amino acids into essential amino acids, non-essential amino acids and conditionally essential amino acid according to their necessity.
What do you mean?
Essential amino acids are amino acids that cannot be synthesized in the body or cannot be synthesized quickly enough, and must be supplied by food.
Now it can be synthesized in the body, so it doesn't matter if you are short of food. It is an unnecessary amino acid.
Conditionally essential amino acids mean that cysteine and tyrosine can be converted by methionine and phenylalanine. If you eat it in food, you don't need so many transformations.
It is generally believed that among the nine essential amino acids needed by human body, infants have one more histidine than adults.
Essential amino acids: they cannot be synthesized by themselves or the synthesis speed is not fast enough, so they must be taken from food.
Amphetamine acid, methionine, lysine, threonine, tryptophan,
Leucine, isoleucine, valine, histidine
I know it is difficult for normal people to remember, and memory is of no practical value to ordinary people.
We just want to know what to eat is good for our health.
We eat three kinds of food.
Complete protein refers to protein, in which all kinds of essential amino acids are complete, sufficient and appropriate in proportion, which can not only maintain the health of adults, but also promote the growth and development of children.
That is what we call high-quality protein.
Such as whey protein in milk, casein, ovalbumin in eggs, lecithin, albumin in meat, muscle protein, soybean protein in soybeans, gluten in wheat, gluten in corn, etc.
So we say that milk, eggs, meat, poultry and soybeans are all very high-quality protein.
Semi-complete protein means that amino acids must be complete, but some of them are not enough and the proportion is improper, which can maintain life, but can not promote growth and development.
Wheat gluten
There are incomplete protein, in which the types of essential amino acids are incomplete, which can neither sustain life nor promote growth and development. Such as mucin in animal mustard tissue and skin, bean protein in pea and corn protein in corn.
So what can you eat to supplement the quality of protein after learning?
Eggs, milk, meat, poultry, fish and shrimp, bean products, etc.
For women, they love beauty very much and like to eat pig's trotters and pigskin, because we think they are rich in collagen?
This is a big scam.
This is a big scam aimed at making money.
Collagen is really good for the skin, and the aging of the skin is really related to the loss of collagen, but it does not mean that external use will have an effect. Because eating it will become amino acid recombination, pigskin and trotters are incomplete protein, and the types of essential amino acids are incomplete. So it's useless. Moreover, pigskin contains a lot of fat, and animal fat contains a lot of saturated fatty acids, which is a good food for fattening.
How many people need it, protein?
Theoretically, adults can achieve zero nitrogen balance by ingesting 30g protein every day. However, considering the safety, digestion and absorption, and the fact that plant food is the main food in China, the utilization rate of plant food is low. According to energy calculation, protein should account for 65,438+02%-65,438+04% of the total energy intake. Therefore, the Nutrition Society of China introduced that in 2065, 438+03, the adult male protein was about 65g, and the female was 55g.
How to measure protein in food, we often use an indicator "nitrogen". The nitrogen content in most protein is quite close, equal to 16%, which is equivalent to 6.25g( 100/ 16) protein per gram of nitrogen. The conversion factor is 6.25.
Nitrogen balance is very important. We excrete about 12g of nitrogen every day. If it is increased, urine will also increase. If it is reduced, it will also be reduced. We can still excrete 2-4g of nitrogen every day without ingesting any protein. It shows that protein is continuously decomposed into nitrogen-containing substances in the body and excreted with urine.
Constantly decompose and discharge. To maintain nitrogen balance.
Therefore, we should first choose some complete protein, and then consider the biological value of these foods. Biological value is the degree to which food is utilized by the body after being digested and absorbed by protein, that is to say, the higher the utilization degree of protein, the higher the nutritional value of protein.
This is a common food.
Careful people will find that there are animal proteins and plant proteins here.
Have you noticed the ingredient list of protein powder sold in our store?
You find that the first one without ingredient list is soy protein isolate, not plant protein, and concentrated whey protein is animal protein.
Why do you want to make protein powder?
Because protein has complementary functions.
The farther the biological species of food is, the better, and the combination of animals and plants is better than pure plant food.
The more kinds of collocation, the better the effect.
Eat as close as possible.
For example, if corn, millet and soybean are eaten separately, the biological price is only 60, 57 and 64, but if they are eaten at the ratio of 40%, 40% and 20%, it will directly increase to 73.
When flour, millet, soybean and beef are eaten alone, the biological price in protein is only 67\57\64\76, but when they are mixed at the ratio of 365,438+0%, 46%, 8% and 65,438+05%, the biological price can be increased to 89, which shows that the mixed consumption of animals and plants is better than the simple consumption.
Protein is very important to human life.
Lack can lead to diseases, there are two main types.
Wasting type and edema type.
Edema type is common in children under 5 years old. After weaning, they can't get enough protein. They are fed starchy foods that contain little starch in protein, such as rice paste, noodles and sweet potatoes.
The main manifestations are edema, skin edema of limbs, especially lower limbs, and skin pigmentation. Plaque, inflammation, ulceration, hair discoloration, easy to break, fall off, liver enlargement, slow external response, indifferent surface and slow growth. Failure to take timely measures will lead to death.
Big-headed doll is a typical example of insufficient intake of protein caused by replacing animal protein with flour protein.
There is also a lean type, which is relatively rare in China. Mainly exists in poor countries and regions.
The main manifestations are emaciation, subcutaneous fat reduction or disappearance, sunken cheeks, prominent cheekbones, dry and wrinkled skin, sparse hair and easy shedding, growth retardation, anemia, apathy and decreased resistance.
Protein is very important. I hope you can learn something.