When choosing bananas in fruit shops, people generally prefer to be golden yellow. The next best thing, you can take a little cyan, put it at home and it will naturally turn yellow, and then eat it. Once you find black spots on the surface of bananas, you will put them down immediately.
Some people say that bananas should be bought with black spots. The long black spots on bananas indicate that they are mature, and the immune activity of mature bananas is much stronger than that of turquoise bananas. Can spotted bananas be eaten? Are bananas required to be spotless just for beauty or for human health?
This kind of black-spotted banana is very common.
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If you want to know whether eating spotted bananas is harmful, you must first confirm how the black spots on bananas are formed.
Like other plants, bananas get sick. Such as yellow leaf disease, anthracnose, scab, thrips, fruit cracking and so on. Among them, suffering from anthrax will make bananas appear black spots. Anthracnose is a fungal disease caused by banana anthracnose. This disease only occurs when bananas are ripe. Therefore, after ripening, brown round spots will appear on the pedicel and epidermis of the diseased banana fruit, and the area will gradually expand into large spots. After two or three days, the whole fruit will turn black and even rot.
It is called anthrax because it is similar to human anthrax symptoms. I believe that with this connection, people are even more reluctant to buy this kind of banana. The use of anthrax biological weapons during World War II left an unbearable impression on people. Anthrax is an infectious disease of human beings with a very high mortality rate. So will eating bananas with anthrax make you sick?
The answer is no, Colletotrichum gloeosporioides only harms bananas and has no effect on human beings. What's more, anthrax, which turns bananas black, has nothing to do with anthrax virus, and of course it can't make people sick. Black skin means that bananas are ripe. It tastes sweet and good at this time, which is the most suitable for eating. Don't eat the pulp if it turns black after a few days.
Sick bananas will turn black, and normal bananas will turn black if they are left for a long time. What's going on here? It turns out that this is related to the fact that banana epidermal cells contain a kind of carbon oxide. Usually, the cell membrane is tightly wrapped with oxidized carbon to protect it, just as human skin protects flesh and bones. Once bumped, or frozen at low temperature, the cell membrane will rupture. The oxidized carbon inside comes into contact with the oxygen in the air, and the oxygen turns black, so some small spots will naturally appear. You can do an experiment if you can. Take out some bananas without spots and put them in the refrigerator. After a few hours, black spots will appear on the banana skin. Therefore, people who sell bananas in winter will wrap the baskets with plastic sheets to ensure the temperature and prevent bananas from turning black at low temperature, which will affect the appearance.
Not all bananas are beautiful.
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So, can this banana with black spots be eaten? Of course. When the banana peel turns black, the pulp inside is ripe and no longer bitter, so people can eat it. Therefore, when consumers choose bananas, if they don't care much about the appearance, they don't have to worry about the black spots on them. As long as the pulp inside is ok, you can eat it.
Compared with normal bananas, has the value of black-spotted bananas increased or decreased?
There is a saying circulating on the internet? Can bananas with more black spots fight cancer? In fact, this statement was first made in 2006? Professor Masayoshi Yamazaki of Tekyo University in Tokyo? An article appeared. However, apart from bananas, they contain so-called? Seventh nutrient? 1), Yamazaki no longer has any other research results on the Internet. At present, there is indeed a lot of research on food cancer prevention, and it is also an important development direction of cancer medicine to isolate effective components from plants that can treat cancer. However, at present, Japanese scholars have only studied bananas in animal experiments at most, and it is still unknown whether it is really effective for human body. Therefore, there is no clinical trial and lack of data to support the claim that bananas with black spots can fight cancer, so we can't blindly draw conclusions.
Finally, for the sake of beauty, I teach a few tips for banana preservation. Never put it in the refrigerator. Bananas are usually picked when they are ripe in June or July, so they look fresh. The suitable storage temperature of picked bananas is about 65438 03℃, while the storage temperature of fruits and vegetables in the refrigerator is about 4℃, and the highest temperature of 8℃ can not meet the requirements. Put bananas at this temperature. If bananas are immature and prone to chilling injury, they will not mature. If it is ripe, it will turn black in a day and the pulp will become soft and rotten. If you want to prolong the storage time of bananas, you can wrap the roots of bananas with plastic wrap. The principle is simple. The ethylene gas released by bananas can accelerate the ripening and turn brown, and most of the ethylene gas comes from the roots of bananas, which can slow down the ripening process after being wrapped. In addition, smearing lemon juice or vinegar on the cut banana roots can also prevent the banana roots from turning brown.
In addition, we should remind everyone that it is best to choose fresh and slippery bananas when eating, but eating too many bananas will lead to diarrhea, bloating and other symptoms. Generally, it is advisable to eat 1-2 bananas every day.
Remarks:
1 so-called? Seventh nutrient? , is actually a very general concept. Protein, fat, carbohydrates, minerals, water and vitamins are six essential nutrients for human body. At present, dietary fiber is usually called? Seventh nutrient? .
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Author: Zhang