Bananas taste delicious, containing vitamins, a variety of trace elements; easy to digest and assimilate, have the effect of detoxification; after eating can make a person physically and mentally happy, have? The bananas have a good flavor and contain many vitamins and micronutrients. The price is not expensive; with so many advantages, no wonder it is the Monkey King's favorite, but also one of the favorite fruits of mankind.

When picking bananas at the fruit store, people generally love the golden yellow ones. Instead, it can be slightly greenish color, and it will naturally be yellow when you put it at home, and then you can eat it again. And once you find the surface of the banana with black spots, you will immediately set aside.

Some people also sing the opposite, buy bananas should buy bananas with black spots. Bananas with black spots indicate that it is ripe, ripe bananas immune activity compared to green bananas to be much stronger. Are spotted bananas edible or not? Is the requirement for bananas without spots just for aesthetic reasons or for human health?

Are these black-spotted bananas common

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To find out if eating spotted bananas is harmful, you first have to identify how the black spots on bananas form.

Like other plants, bananas can suffer from diseases. For example, yellow leaf disease, anthracnose, black star disease, flower thrips, fruit cracking disease and so on. And among them, suffering from anthracnose will make the banana show black spot symptoms. Anthracnose is caused by the banana prickly panicle fungus and is a fungal disease. This disease only becomes visible when the banana is ripe. Therefore, after ripening, a single brown circular spot appears on the stalk and skin of the infested banana fruit, which gradually expands and joins together to form a large spot. After two or three days the whole fruit turns black and even rots.

The reason why it is called anthracnose is because the symptoms are similar to those of human anthracnose. I believe that this connection makes people more reluctant to buy this kind of banana. The use of anthrax biological weapons during World War II left an unpleasant impression on people. Anthrax is an infectious disease in humans and has a very high lethality rate. So can you get sick from eating anthrax-affected bananas?

The answer is no. The answer is no. Anthrax only affects bananas and has no effect on humans. Moreover, the anthrax that blackens bananas has nothing to do with anthrax, so of course it can't make people sick. The blackening of the skin indicates that the banana is ripe and is best eaten when it is sweet and tasty. If it has been left for a few more days, causing the flesh to blacken, don't eat it.

Diseased bananas will be black, normal bananas placed for a long time will also be black, which is how it is? Originally, this is related to the banana epidermal cells contain a kind of oxidized carbons. Normally, the cell membrane to oxidized carbon dioxide tightly wrapped to protect, like the human body's skin to protect the flesh and blood, bones, the same. Once bumped, or frozen at low temperatures, the cell membrane is broken. Inside the oxidized carbons came into contact with the oxygen in the air, in the oxidation of oxygen into black, naturally appeared some small spots. Condition can do an experiment, take out some bananas without spots in the refrigerator, a few hours after the banana skin will appear black spots. Therefore, in the winter time, banana sellers will use plastic sheeting to put banana baskets wrapped up, is to ensure the temperature, to prevent bananas in the low temperature black, affecting the appearance of the sale.

Not all bananas are beautiful

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So, can you eat this banana with black spots? Of course it can. The blackening of the banana peel is a sign that the flesh inside is ripe and no longer bitter, and people can eat it. Therefore, when consumers choose bananas, if they are not very concerned about the appearance, they do not have to worry about the black spots on the top. As long as the pulp inside is not a problem, you can eat.

Compared with normal bananas, is the value of black spot bananas increased or decreased?

There is a widely circulated claim online that ? The bananas with more black spots can fight cancer. Tokyo Teikyo University professor Yamazaki Masa? s article appeared. However, apart from the fact that bananas contain the so-called ? The Seventh Nutrient (1), Masa Yamazaki has not published any other research results on the Internet. It is true that there has been a lot of research on the prevention of cancer through food, and the isolation of active ingredients from plants that can treat cancer is also an important direction in the field of cancer medicine. But from the current point of view, Japanese scholars on the banana research at most only to animal experiments, whether it is really effective on the human body, is still an unknown. So, for the long black spots of the banana can be anti-cancer claims, not after clinical trials, lack of data support, not blindly jump to conclusions.

For the sake of aesthetics, and finally teach a few tricks to keep fresh bananas. Never put in the refrigerator to freeze. Bananas are usually grown to six or seven ripe when they are picked, so look fresh. The appropriate temperature for storing bananas under the picking is about 13 ℃, while the temperature for storing fruits and vegetables in the refrigerator is about 4 ℃, and up to 8 ℃ does not meet the requirements. Put the banana in this temperature, such as if the banana is not ripe, prone to cold damage, it can not be ripe; if it is ripe, put a day will turn black, the flesh will also become soft. If you want to prolong the preservation time of bananas, you can wrap the root and stem parts of bananas with plastic wrap. The principle is very simple, bananas release ethylene gas can accelerate the ripening of bananas, turning brown, and most of the ethylene gas comes from the banana's rhizome, wrapped to slow down the process of ripening bananas. In addition, a little lemon juice or vinegar on the root of the cut banana can also prevent it from turning brown.

Also want to remind you, consumption of the best choice of fresh, meat smooth bananas, but excessive eating bananas will lead to diarrhea, bloating and other symptoms, generally eat 1-2 bananas per day is appropriate.

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Note:

① The so-called ? The seventh nutrient? , is actually a very generalized concept. Protein, fat, carbohydrates, minerals, water and vitamins are the six essential nutrients, the current common dietary fiber collectively referred to as? The seventh nutrient?

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Written by Zhang Lianmin