First, bananas are high in nutrition and low in calories. Abnormal living habits on weekdays are the causes of cancer, hypertension, diabetes and other diseases. In order to prevent these diseases, moderate exercise and a balanced diet are very important. Moreover, balanced nutrition can prevent cancer, and it is "banana" that attracts everyone's attention. The Japanese Cancer Society published a report last year that bananas can improve immunity and prevent cancer. Eating two bananas every day can effectively improve physical fitness. Besides, bananas are cheap, easy to eat and easy to carry. They are nutrients to maintain health and can really be called "magic fruits". Bananas are quite effective in losing weight because they are low in calories and rich in dietary fiber. Bananas are sweet, so people will think that the calories must be high. In fact, the calorie of a banana (net weight about100g) is only 87 calories, which is only about half lower than that of a white rice (150g, 220 calories). Second, bananas can be used as breakfast and diet food. In the busy life, more and more people use healthy food or supplements to supplement the unbalanced diet. Bananas contain almost all vitamins and minerals, so you can easily get all kinds of nutrients from bananas. Bananas contain a lot of potassium and magnesium. Potassium can prevent blood pressure from rising and muscle spasm; Magnesium can relieve fatigue. Because bananas are well digested and absorbed, they can be eaten with peace of mind from children to the elderly and supplemented with balanced nutrition. Recently, there are more and more people who don't eat breakfast. Breakfast is the energy source of the day. Therefore, bananas, which can maintain energy immediately and for a long time, become the most suitable food for breakfast. In addition, because bananas are low-calorie foods, even people who are losing weight can enjoy them with confidence. Third, bananas lower blood pressure and relieve constipation. From a nutritional point of view, bananas are beneficial fruits rich in starch. From the perspective of traditional Chinese medicine, bananas are sweet and cold, which can clear away heat and moisten intestines and promote gastrointestinal peristalsis, but they are not suitable for people with spleen deficiency and diarrhea. There is always a reasonable explanation for everything. Bananas are cold, and according to the principle of "those who are hot are cold", they are most suitable for people who are hot and dry. People with hemorrhoid bleeding and people with hot and restless fetus can eat raw banana meat. But it is precisely because bananas are cold that people who are prone to deficiency and cold had better avoid them. For example, people with stomach cold (light mouth and bloating), deficiency cold (diarrhea and dizziness), nephritis (also deficiency cold) and swollen feet during pregnancy, it is best not to eat bananas raw. Banana meat can't be eaten unless it is cooked, and its coolness is reduced. As for colds and coughs, bananas are not edible, but it is acceptable to steam bananas before eating. The folk prescription is more effective to treat chronic cough with banana stewed rock sugar; Cook wine with bananas as a diet. Modern medicine suggests that banana can cure hypertension because it is rich in potassium, which can balance the adverse effects of sodium and promote the growth of cells and tissues. Banana can be used to treat constipation because it can promote gastrointestinal peristalsis. Most interestingly, German researchers claim that bananas can cure depression and emotional anxiety because they can promote the brain to secrete endorphins. In short, people who are hot and dry can eat a banana a day, but if they are afraid of bananas catching cold, they can choose to eat banana (which has stronger laxative power) and imperial bananas. Bananas are not only delicious, but also have many medicinal values, so many people eat bananas in large quantities in pursuit of health. However, we need to remind everyone that any delicious food should be eaten in the right way, otherwise it will be counterproductive, not only unhealthy, but may even bring adverse effects. Immature bananas are easy to cause constipation. As we all know, when bananas are immature, the skin is turquoise, and the skin is peeled off and cannot be swallowed. Mature bananas, with astringent taste swept away, are soft, waxy and sweet, and are deeply loved by children and the elderly. Bananas are tropical and subtropical fruits. In order to facilitate storage and transportation, when picking bananas, you can't wait until the skin is green. All bananas we eat in the north are ripe before they are cooked. The astringency of raw bananas comes from the large amount of tannic acid contained in bananas. After the banana is ripe, although the astringency is no longer tasted, the tannic acid component still exists. Tannic acid has a very strong astringent effect, which can form dry and hard feces, thus causing constipation. The most typical thing is that after eating bananas, the elderly and children can't help but defecate, but they can have obvious constipation. Excessive consumption of bananas will lead to imbalance of trace elements. Bananas are delicious fruits, so some people eat bananas in large quantities at one time. As we all know, this is very bad for your health. Bananas contain more elements such as magnesium and potassium. Although these mineral elements are necessary for human health, if they are ingested too much at one time in a short period of time, the contents of magnesium and potassium in the blood will increase sharply, resulting in the imbalance of potassium, sodium, calcium, magnesium and other elements in the body, which is harmful to health. In addition, eating more bananas will also cause gastrointestinal dysfunction and excessive mood swings due to the greatly reduced gastric acid secretion. Therefore, bananas should not be eaten in excess.