Can eating yam make hair black, can you eat yam black

Why does yam turn black after peeling, and can I still eat it after it turns black? Use these two methods to prevent blackening.

Can you eat yam blackIn daily life, yam is a common health food. Yam has digestive function and antidiarrheal function, mainly used for spleen deficiency, diarrhea, chronic enteritis and indigestion. Yam is eaten in a variety of ways, and is loved by people because of its soft and glutinous taste and rich nutrition.

Many people will find that the yam turns black when cooking, so can you eat the yam when it turns black?

Can you eat yam blackGenerally speaking, the blackening of yam is a very common phenomenon, and many people will encounter this situation, which is caused by many reasons such as oxidation, mildew, etc. Generally speaking, when we peel the skin of the yam after presenting a milky white pulp, if the yam is black after peeling for more than ten minutes, it is edible, because this is caused by oxidation, and there is a kind of yam itself is black, this situation is caused by mold, it is inedible, and another point to note is that the yam is easy to rot after soaking in water. Once the bacteria multiplies after water immersion, it decays.

The color will become very dark, and it will become dark. This yam cannot be eaten.

Can you eat yam blackYes, yam is rich in carbohydrates and water, and it is easy to become moldy if not stored properly. If it is because of oxidation and blackening, it does not have much to do with eating, but if it is a yam parasitic by black coarse color mold, it is not edible if it appears black.

Whether the yam can be eaten when it is black depends on whether the yam has spoiled or not.

If the surface of the yam is black, and the inside is white after peeling or cutting, it can be eaten; If it is not black on the surface, it cannot be eaten.

If it is due to the fact that the yam is not applied in time after peeling, resulting in oxidation in contact with oxygen in the air, causing the surface of the yam to turn black, this is a normal oxidation phenomenon, and the yam can be eaten at this time.

If the yam turns black, it means that there are black hyphae or spots on the surface, which are still black after peeling and cutting, and there are also ulcers, abnormal rancid smell, etc., it means that the yam has deteriorated and cannot be eaten.

Causes of blackening of yams

After being placed in the air for a long time, oxidized yam contains a certain amount of polyphenols, and also contains polyphenol oxidase, which is exposed to oxygen in the air after being cut, and the activity of the enzyme is enhanced, which will oxidize the polyphenols into quinones, so that it is easy to appear black, which is the same as apples, eggplants, potatoes, etc. After cutting, it changes color over time.

After the yam is peeled, a layer of black substance will appear on the surface, which is due to the phenomenon that the yam is oxidized after contact with oxygen in the air. After the yam is oxidized, it does not produce toxic substances, and there is no harm to the body, so it can be eaten with confidence.

The main reason why the yam turns black after peeling is because the phenolic substances in the yam are oxidized after contact with the air, and then the quinones with color are formed, so the phenomenon of blackening occurs.

The yam turns black after peeling and can be eaten, it turns black mainly because of the color that appears after the oxidation of its own phenolic substances, and it does not belong to the range of deteriorationIf it is because of mildew, the yam that turns black cannot be eaten.

Don't eat it if it's black after storing it, but if it's black after washing and scraping the skin, you can eat it if it's blackened in the water.

The yam turns black after passing through the water because the yam has browned. The yam can be eaten normally after it turns black after being watered.

Browning is divided into two categories: enzymatic browning and non-enzymatic browning according to the mechanism of its occurrence. Enzymatic browning mostly occurs in fresh plant foods such as fruits and vegetables, and is the result of phenolases-catalyzed phenolic substances to form quinones and their polymers.

Plant tissues contain phenolic substances that act as respiratory transport substances in intact cells. When the tissue is destroyed, a large amount of oxygen invades, breaking the balance of the redox reaction, so that the accumulation of oxidation products and further polymerization and oxidation of quinone occurs, forming black.

Therefore, the yam turns black after passing through the water because the yam is destroyed during the peeling process, and the oxidation reaction occurs when it comes into contact with the air.

Therefore, the blackening of yam over water is a result of oxidation, and this blackening does not affect consumption, but it does not look good.

Extended Information: Tips to prevent yam from turning black.

1. Peel and slice the yam and put it in water quickly, which can effectively prevent the yam from turning black.

2. If the yam turns black after cutting, you can put the yam in clean water, rinse it, and then use a skin scraping tool to remove the black on the surface.

3. Before frying the yam, you can sprinkle a small amount of salt on the surface of the yam, and the yam will not change color.

4. Put the yam in water after slicing, and put some vinegar in the water to prevent it from turning black.

The yam is black and not poisonous.

Because the organic molecules in the yam and the oxygen in the air oxidize each other, it does not affect the food, and the color is not good-looking, it is recommended to soak it in water after cutting, and take it out before frying, and it is best to eat it two to three times a week.

What are the benefits of eating yam for hair is yam good for hair.

Eating more yam can grow hair, but because yam has the effect of astringency, so people with dry stool should not eat, eating lotus seeds can not only nourish hair and skin care, but also nourish the heart and calm the nerves, and it is most effective in preventing premature birth, miscarriage, and backache in pregnant women. The effect of yam: yam is sweet, not hot or cold, it is a flat food, which has the effect of strengthening the spleen and lungs, invigorating the stomach and kidneys, strengthening the kidneys and improving the essence, brightening the ears and eyes, helping the five organs, strengthening the muscles and bones, soothing the nerves and prolonging life.

It is mainly used for the treatment of spleen and stomach weakness, fatigue and weakness, loss of appetite, long-term diarrhea, lung qi deficiency, phlegm, asthma and cough, kidney qi deficiency, waist and knee soreness, weakness of the lower limbs, thirst and frequent urination, sperm loss, white turbidity under the belt, redness, obesity and other diseases.

When it comes to the effect of yam to strengthen the kidney and improve the essence, then we have to mention hair loss. People with hair loss know that there is a type of hair loss called kidney deficiency type alopecia in the hair loss classification, and this type of hair loss accounts for a large proportion of people with hair loss. Traditional Chinese medicine believes that the withering of hair lies in the vigor of qi and blood, and the kidney is the innate foundation of human beings and the driving force behind the functional activities of the internal organs.

So the quality of the kidneys has a very big impact on the hair. This is proved by ancient books: "Kidney deficiency says that the "Yellow Emperor's Neijing" contains:

The woman was seven years old, her kidneys were solid, and her teeth were ......Five-seven, Yangming's pulse is declining, the face is scorched, and the hair is falling. The husband is five or eight, his kidney qi fails, and his teeth are withered. The effect of yam has the effect of strengthening the kidney and improving essence, so yam can be praised as the best medicine for kidney deficiency type hair loss.

The medicinal value of yams.

1. Yam is not only a good vegetable for eating, but also a commonly used medicinal material. Artificially planted yam, the flesh is white, the taste is sweet and powdery, the size is large and firm, and it is mostly edible.

2. Yam is the tuber root of the dioscaceae plant, which has the effect of nourishing the spleen and stomach, invigorating the lungs and kidneys. It can be used for spleen deficiency and diarrhea, chronic enteritis, lung deficiency, cough and asthma, chronic gastritis, diabetes, spermatozoa, enuresis, and other diseases.

3. Yam as a health food, in our country has at least 2000 years of history, written in the Eastern Han Dynasty "Shennong's Materia Medica" will be listed as the top grade, but the yam at that time may be wild, has not yet entered the stage of artificial cultivation. In the Tang Dynasty, the "Four Seasons Compilation" quoted the Taoist Wang's "Mountain Dwelling Techniques", which made a more detailed record of yam cultivation. Traditional Chinese medicine believes that yam "replenishes deficiency in the main injury, removes cold and heat evil qi, replenishes and benefits qi, grows muscles, and serves the ears and eyes for a long time".

Many classical medical texts have given high praise to yams. Yam is a well-known nourishing grip.

4. According to modern scientific analysis, the biggest feature of yam is that it contains a large amount of mucin. Mucin is a mixture of polysaccharide proteins, which has a special health care effect on the human body, can prevent fat deposition on the cardiovascular system, maintain the elasticity of blood vessels, and prevent the premature occurrence of atherosclerosis. Rollable pins reduce subcutaneous fat accumulation.

It can prevent the atrophy of connective tissue and prevent the occurrence of collagen diseases such as rheumatoid arthritis and scleroderma.

Many people find that the peeled yam turns black after leaving it for a while, which is due to the oxidation caused by the contact of phenolic substances in the yam with oxygen. And there is also a situation where after boiling the yam, you will find that the yam turns black. After boiling, the yam turns black, which will make many people wonder if they have bought a spoiled yam, so if it turns black after cooking, can it continue to eat?

Why do yams turn black.

The yam turns black because the fresh yam is peeled and comes into contact with the air, and an oxidation reaction occurs. After the yam is peeled, it is exposed to the air, and the polyphenols contained in the yam oxidize with the oxygen in the air to produce o-quinones, which will be further oxidized and polymerized to form brown pigment and melanin if it continues to be in contact with the air. In addition, if you cut the yam with a kitchen knife, the yam may change color when it comes into contact with the metal surface of the knife, including the iron pot when stir-frying.

This phenomenon is very common in life, such as apples, media, lotus roots, etc., and the color of the meat will gradually darken after being cut into contact with the air for a long time.

Can you eat the yam when it turns black.

I can eat it. The yam turns black because it is oxidized, but it will not affect the consumption of the yam, and there will be no inappropriate food after eating, so you can eat it with confidence. It's just that it doesn't look good when you put it into the dish.

The way the yam does not turn black.

1. Soak in salt water.

Soak the peeled yam in salted water so that it doesn't turn yellow or black anymore.

2. Soak white vinegar.

Put the peeled yam in the water mixed with white vinegar so that it does not turn black.

3. Peel quickly.

There are a lot of whiskers on the yam with the skin, and these whiskers will slow down the peeling speed when peeling, so put the yam on fire and quickly pass it to burn off the whiskers on it, so that the peeling becomes faster and the time in contact with the air is reduced.

4. No knife cutting.

The yam will change color when it touches the metal knife surface, so you can use a bamboo knife or plastic blade to cut it, or use a spoon to make a circle on the skin of the yam first, and then use your hand to break it.

5. Heat first.

In order to avoid the yam changing color after touching the iron pot, first put the yam with skin in a steamer or microwave oven and heat it for one minute, so that the polyphenol oxidase can be invalidated, so that it will not turn black.