Investigate and list the prices of off-season vegetables and fruits; what are the disadvantages of eating them regularly? What should you pay attention to when buying food in the supermarket?

The so-called bad quality mainly comes from two reasons:

1. Although the growth environment of off-season agricultural products can be adjusted by some means, some special ingredients will also be added. Growth hormone-like substances to adapt to counter-season. Such as rooting agents and so on. These have little to do with the environment, mainly because of the plant's own biological clock. The damage to the human body comes to a certain extent from the damage to the human body's own skills caused by the accumulation of chemicals

2. Off-season agricultural products do not grow naturally, so their nutritional structure, etc. are different from those of normal agricultural products. There are differences, and this difference is also unhealthy in some senses. ?

In May this year, a consumer tip came from the Beijing Food Safety Office: Citizens should be careful when buying vegetables out of season. Experts say that off-season vegetables are mainly greenhouse vegetables. If they are pollution-free foods, their quality is not much different from products in normal seasons. But if not, be careful. The reasons are as follows:?

1. Too many pesticides have accumulated in greenhouse vegetables?

Off-season vegetables are mainly greenhouse vegetables. The temperature and humidity in the greenhouse are relatively high, so it is not suitable for greenhouse vegetables. Conducive to the degradation of pesticides, leaving most of them remaining on vegetables. Long-term accumulation of trace amounts of pesticides in the body can easily cause damage to the human liver and kidneys, causing anemia, peeling, and even leukemia. Greenhouse vegetables lack enough light and have high nitrate content, which can lead to dizziness, nausea, convulsions, coma, and even death. Long-term consumption of such contaminated vegetables can cause chronic or acute poisoning. ?

2. Long transportation time, high nutritional losses?

Off-season vegetables are often transported over long distances, which will cause certain nutritional losses during transportation. Nutritionists have determined that during transportation, green garlic and onions will lose 50% of their carotene content, and mung beans will lose 60% of their vitamin C content within 3 days. Natural anti-cancer substances and enzymes in some foods are also destroyed during transportation. In addition, various dust and fuel exhaust gases on the road, as well as hot, cold, humid and dry climate changes in a short period of time will affect the nutritional content of vegetables. ?

It was this piece of news from the government department that aroused widespread concern in society, and thus kicked off the theory that off-season vegetables are harmful. ?

Out-of-season vegetables, let’s see what the experts say?

Agricultural experts say: “The theory that out-of-season vegetables are harmful” is not accurate?

Out-of-season vegetables are not available. Is it a greenhouse vegetable?

Off-season vegetable production can be summarized into three major types: 1. Using the three-dimensional climate resources in mountainous areas to produce off-season vegetables in summer and autumn; 2. Using the warm microclimate in winter and spring to produce off-season vegetables in winter Production, such as Hainan and other regions, has sufficient light and heat resources and is a suitable area for the development of winter-planted off-season vegetables. 3. Use protective or semi-protective facilities for off-season cultivation. This is what we call greenhouse vegetables. ?

High temperature is more conducive to the decomposition of chemical substances?

For “off-season vegetables grown in greenhouses, high temperature and humidity will affect the degradation of pesticides and reduce the amount of pesticide residues. Larger." This statement is not accurate. ?

Experts pointed out: Whether vegetables are contaminated has nothing to do with whether they use off-season planting methods, but is related to factors such as whether pesticides and chemical fertilizers are used appropriately or excessively. Because different types of pesticides have different decomposition conditions, it cannot be generalized as "high temperature". In most cases, high temperatures are actually better for the breakdown of chemicals. In addition, "high nitrate content" has nothing to do with light, but depends on whether excessive nitrogen fertilizer is applied and whether there is sufficient light, which has nothing to do with food safety. ?

The nutritional value and taste are slightly inferior?

As for the nutrition and taste of greenhouse vegetables, experts said: greenhouse vegetables are not as good as growing under natural conditions due to the length and intensity of sunlight. vegetables. Sunlight affects the synthesis of sugar and vitamins in vegetables, so the sugar and vitamin content of off-season vegetables will be slightly lower than similar seasonal vegetables. This is why most off-season vegetables taste lighter.

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But this does not mean that the nutrition of off-season vegetables is not as good as that of seasonal vegetables, because when the human body eats vegetables, in addition to vitamins, it mainly focuses on the absorption of components such as fiber and chlorophyll. As for sugar and Vitamins can be supplemented through other foods. Off-season vegetables can be eaten with confidence as long as they are cooked properly. ?

Traditional Chinese medicine says: Eat less off-season vegetables?

Food and medicine must pay attention to "qi" and "taste". Because according to traditional Chinese medicine, food and medicine are composed of smells, and their smells can only capture the essence of heaven and earth when they are in season, that is, when they grow and mature in accordance with the solar terms. ?

There is a famous saying in the "Huangdi Neijing" called "Prepare things at the end of the year", which means that medicines and food should be collected and prepared according to the yin and yang of nature. Such medicines and food can obtain the essence of heaven and earth. Qi, pure smell and high nutritional value. Therefore, people should eat solar terms vegetables, and it is best to take wild herbs when taking medicine. ?

Animals and plants can mature and contain enough scent within a certain growth cycle. Vegetables that violate the natural growth laws and the law of growth and decline of cold and heat in spring, summer, autumn, harvest and winter storage will cause food to be cold and hot, and the smell will be confusing, becoming the so-called "vegetable-like appearance". Without seasonal temperament, it has only form but no substance. For example, cabbage in summer may look good, but its taste is far inferior to that in winter; tomatoes in winter are mostly hard and tasteless. These off-season vegetables contain too many hormones and are harmful to the human body if eaten for a long time. Confucius once said: "If there is no season, don't eat." That is to say, try not to eat dishes that are not in line with the solar terms. ?

How to safely eat off-season vegetables? ?

Society has developed to the current level. If we can only eat potatoes, cabbage and carrots every winter, it is probably impossible. Then how can we choose among the many off-season vegetables? The least dangerous? How can we eat out-of-season vegetables in the healthiest way? ?

It is best to go to regular supermarkets or farmers’ markets to buy vegetables?

Vegetables from small stalls and vendors are as bright and beautiful in appearance as those in regular supermarkets and farmers’ markets, and the prices are also better. Cheaper, which just caters to the psychology of some consumers. But these vegetables may have problems of one kind or another. ?

The scattered stalls on the market are generally self-produced and sold without any relevant quality and safety testing. They may not be safe for consumption and pose major hidden dangers. Since they are relatively scattered and there is no unified purchasing channel, the quality inspection department has no way to conduct inspections. Therefore, you must go to regular supermarkets or farmers' markets to buy vegetables. Don't be greedy for small gains and lose big. ?

Out-of-season vegetables should be chosen with “coats”?

Be careful when choosing vegetables and carefully identify their shapes and colors. Try to buy as few vegetables as possible with strange shapes and colors; although some vegetables have been ripened, there will still be traces of greenness left on the peel or other places, so be careful when buying them. ?

Absolutely pollution-free agricultural products almost do not exist. "Pollution-free is only a relative term. As long as it passes relevant national testing, it is a vegetable that can be eaten with confidence. Therefore, it is best for citizens to purchase clearly Labeled green and pollution-free vegetables?

Experts remind the public that choosing seasonal vegetables and eating local dishes is a better choice than eating out-of-season vegetables. Following nature is the best health rule. . If you want to buy off-season vegetables, it is also best to buy more onions, carrots, eggplants, etc. These vegetables with skins have less pesticide residues?

Cleaning and preparation methods are very important?

Pesticides are easy to remain on vegetables. If the vegetables can be peeled, try to peel them. When cleaning vegetables that cannot be peeled, soak the vegetables in clean water for 20 to 30 minutes to allow the pesticides to be fully absorbed. Dissolve, and then rinse repeatedly with clean water; or soak the vegetables in rice washing water for 10 minutes, then pour out the soaking liquid, and then rinse repeatedly with running water. The alkaloids in the rice washing water have a good dissolving effect on pesticides; if possible , you can also blanch the vegetables in hot water before proceeding to the next step of preparation, or use methods such as stir-frying to remove residual pesticides on the vegetables.

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We cannot take the off-season vegetables labeled as “pollution-free vegetables” lightly?

The so-called “pollution-free vegetables” refer to certain production methods in a certain ecological environment. Vegetables produced according to technical regulations, tested by statutory professional quality inspection departments, do not contain toxic and harmful substances, and meet national standards. "Safety vegetables" is the common name of "pollution-free vegetables". ?

As a consumer, buying pollution-free vegetables does not mean that you are buying vegetables without the use of pesticides. It is just that the pesticide residues comply with national standards and will not cause harm to the human body. It is best to soak vegetables bought from the market in cold water for about half an hour before eating. ?

Related links: Should you be careful when buying out-of-season fruits?

Although it is winter, there are still many out-of-season fruits on the market. Many out-of-season fruits are ripened and kept fresh using chemicals. In the process, some out-of-season fruits have become "problem fruits." ?

We have listed 4 common problem fruits here to remind everyone to pay attention. ?

Strawberry: hollow in the middle and irregular in shape. Strawberries that are too large are usually caused by excess hormones. After strawberries are treated with ripening agents or other hormone drugs, the growth period becomes shorter and the color becomes fresher, but the fruity flavor becomes lighter. ?

Banana: In order to make the skin of bananas bright yellow and beautiful, some unscrupulous traders use sulfur dioxide to accelerate ripening, but the flesh is still hard and not sweet at all, and sulfur dioxide is harmful to the human body. of. ?

Watermelon: Use ripening agents and expanding agents beyond the standard. The stripes on the skin of this kind of watermelon are uneven, and the flesh is particularly bright when cut open, but the seeds are white, and there is a peculiar smell in the mouth after eating it. ?

Grapes: Some unscrupulous traders and fruit growers use ripening agents to soak unripe green grapes in diluent. After a day or two, the green grapes will turn into purple grapes. Share to one-click sharing QQ space Sina Weibo Baidu collection Renren Tencent Weibo Baidu photo album Kaixin Tencent friends Baidu Tieba Douban Sohu Weibo Baidu new homepage QQ friends and Xun Weibo more...

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As the Spring Festival approaches, many citizens will have this idea when purchasing vegetables and fruits: buy something expensive that they usually can’t bear to eat, but as everyone knows, the prices are relatively high on the market. Most vegetables are out of season. With the popularity of greenhouse vegetables, young people nowadays have increasingly unclear concepts about vegetable seasons. Which vegetables are in season? There is a saying circulating on the Internet that "eating vegetables out of season is against the laws of nature and will destroy your own balance." Is it true?

Liu Yang

Citizens’ concept: Eat “expensive” dishes during the Chinese New Year

Every festival, when relatives and friends gather together, the most common toast is It means "eating well and drinking well". It can be seen that "eating well" has always been the top priority during the festival, and "good food" has naturally become the fundamental requirement for "eating well". The last few days of the New Year are the peak period for citizens to buy New Year's goods. The reporter saw in markets and supermarkets that there was a huge crowd of people purchasing, and there were also many types of vegetables and fruits in various markets.

The reporter’s visit found that the prices of vegetables on the market currently vary greatly. Although most prices increase as the New Year approaches, cheap ones such as Chinese cabbage and potatoes have remained low, such as locally produced cabbage. It only costs 5 cents per catty, radish is only 1 yuan/catty, and sweet potatoes can also be found for 1 yuan/catty. However, most citizens are not inclined to buy these cheap dishes, but think that they should eat something good during the Chinese New Year.

“It’s so shabby to eat cabbage and radish during the Chinese New Year. It’s better to buy some fine vegetables to eat.” Ms. Sun, who lives in the Aoti area, bought cucumbers for 4 yuan/jin and 8 yuan/jin yesterday. Wild rice, peas at 7 yuan/catty, and enoki mushrooms at 10 yuan/catty. Although only a few vegetables cost thirty or forty yuan, she felt that this was how she felt like celebrating the New Year.

Cabbage and potatoes were only eaten by poor families in the past, but now life is better and we can eat some good food. "I bought snow peas, bitter chrysanthemums, and celery today." Mr. Gu, a citizen who lives near Jiangjiayuan, also believes that you should eat some "expensive" dishes during the New Year.

Market visit: “Expensive” dishes are mostly out of season

The reporter walked around the market and found that many of the more expensive dishes are actually out of season, such as Cucumbers in season generally sell for 2 yuan/catty in summer, but in winter they are basically sold for 4 yuan/catty. Recently, the price of green peppers has soared to 7 yuan per catty. It is also a seasonal dish in summer. On weekdays, it costs 3 yuan per catty, not to mention cowpeas, peas, green beans, snow peas and other beans. The current general price is from 5 yuan/catties. The price ranges from 10 yuan per catty to 10 yuan per catty, which is not cheap among vegetables. But in fact, beans and vegetables are seasonal dishes in summer, and the price is not high when they are in season. Even the artemisia that Nanjing people like the most is not actually a seasonal dish. Currently, the price on the market is generally 4-5 yuan/catty, and the wild one is sold for 6 yuan/catty. Bitter melon, eggplant, leeks, lettuce... The reporter saw in the market that most of the dishes were not in season.

Lu Yunlong, manager of Nanjing Zhongcai Agricultural and Sideline Products Logistics Center, told reporters that when he first started working in this industry more than ten years ago, there were only a few kinds of vegetables in the Nanjing winter market, and the pickles of the citizens were also special. There are so many, there are people who stock up on several sacks at home. Nowadays, there are so many varieties on the market. If you calculate carefully, almost 70 of them are not in season.

“It’s hard to generalize when it comes to off-season dishes. Although winter melon and cowpea are considered off-season dishes here, in fact, they are popular in places such as Hainan and Guangxi. They are all seasonal vegetables produced in the season; the other is greenhouse vegetables, which are grown in a natural environment that is artificially created to be different from the external environment; in addition, there is another type that is harvested in the season and has been stored in a cold storage So far, vegetables such as potatoes and garlic are much more expensive. Mr. Lu told reporters that compared with in-season vegetables, off-season vegetables are indeed more expensive. "For example, the net cost of vegetables shipped from Hainan will increase by 40 cents per catty, and vegetables in greenhouses require artificial maintenance, so the price is definitely higher than those in the open air. Currently, there are many high-priced vegetables on the market. They are all out-of-season vegetables.”

Reporter survey: Young people do not distinguish between seasonal vegetables

But for out-of-season vegetables and seasonal vegetables, the reporter randomly surveyed more than ten people who were buying vegetables. Citizens listed "spinach, lotus root, green pepper, artemisia" and other vegetables to ask about the season, and found that most people, especially young people, have difficulty distinguishing the season of vegetables.

"Isn't lotus root in summer? It must be out of season." (Although lotus flowers bloom in summer, lotus roots are purchased in autumn and winter. In addition, lotus roots grow in water, so it is more difficult to go out of season. Therefore, It’s the seasonal vegetable)

“Artemisia must be in season, I remember you can buy it every Spring Festival.” (Artemisia is a wild vegetable, and the seasonal season is naturally spring, but because Nanjing people particularly love it Eat, so now vegetable farmers are adopting greenhouse and other planting methods to let Artemisia go on the market in advance to seize the Spring Festival market)

“In the past, you could tell which vegetables were in season just by looking at the vegetable market, but now there are all kinds of vegetables. , I can’t figure it out anymore.” Ms. Lu, a citizen born in the 1970s, told reporters that her memory of vegetable seasons now depends entirely on her childhood memories. Nowadays, there are all kinds of vegetables. When her children grow up, they may not be able to distinguish vegetables at all. It's time.

The reporter searched on Baidu and found tens of thousands of questions from netizens about the seasonal differences of vegetables and fruits. Some of them were asking about the seasonal differences of vegetables and fruits, and some were asking about eating vegetables out of season. Is it healthy?

Expert advice: It is best to eat seasonal local dishes

“It is not recommended to eat vegetables that are out of season. Traditional Chinese medicine emphasizes that it is best to eat seasonal and local vegetables.” Department of Traditional Chinese Medicine, Zhongda Hospital Wang Changsong, the chief physician of the hospital, told reporters that anyone who has studied traditional Chinese medicine knows that traditional Chinese medicine advocates that eating should not violate the laws of nature. Although no one has yet confirmed that eating out-of-season vegetables causes physical diseases, but out-of-season vegetables The dishes or food shipped across the ocean from other places are always not that good.

“Traditional Chinese medicine pays attention to eating according to the season, which means eating vegetables according to the season. For example, in the summer, when people are sweating profusely, taking a bite of cold and delicious watermelon will immediately feel refreshing and comfortable. In ancient times, watermelon was It is called Baihu Tang, which has the effect of clearing away heat and quenching thirst, which is very good for the body. But if it is winter, the weather is already cold, and if the stomach is still bloated, it is definitely not appropriate to eat watermelon." Nanjing Zhong. Huang Huang from the University of Medicine believes that it is still difficult to say clearly whether off-season dishes are good or not, but what is certain is that people should eat according to their own physique and choose palatable dishes. "Just like there are Malantou in winter, but you can't taste the fragrance and game in spring."

Zhou Mingyuan, deputy secretary-general of the Jiangsu Provincial Cuisine Association, told reporters that in terms of daily eating habits , I don’t eat off-season vegetables very much, mainly because I am worried that greenhouse vegetables use too many pesticides and may not be healthy. Nanjing is a city with four distinct seasons. Each season has its own unique seasonal ingredients. Even in winter when there are fewer ingredients, there are also seasonal dishes with unique flavors such as cress, green vegetables, and bean sprouts. As long as you use the appropriate cooking methods, you can still make them. Come out delicious.

Seasonal vegetables throughout the year

Spring (from January to March in the lunar calendar)

Vegetables: peppers, green peppers, colored peppers, onions, cauliflower, sweet beans, Peas, celery, lettuce, shepherd's purse, rape, spinach, Chinese toon, spring bamboo shoots, malan, gourd, and leek.

Summer (April to June in the lunar calendar)

Vegetables: peppers, loofah, bitter gourd, winter melon, kidney beans, asparagus, wild rice, onions, cucumbers, chayote, pumpkin, amaranth, shansu , water spinach, asparagus, sweet potato leaves, bamboo shoots, lettuce, tomatoes, cabbage, eggplant.

Autumn (July to September in the lunar calendar)

Vegetables: okra, water chestnut, lotus root, pepper, chestnut, winter melon, green beans, sweet potato leaves, beans, yam, cabbage, lentils .

Winter (October to December of the lunar calendar)

Vegetables: green peppers, cabbage, cabbage, onions, cauliflower, carrots, radishes, sweet beans, celery, spinach, mustard greens, sunflower seeds ,lettuce.

The "character" of food

The nature of food refers to the "four properties", namely cold, hot, warm and cool. In addition, some foods have mild eating properties, which are called balanced properties. Foods that can reduce or eliminate heat syndrome are of cold-cooling nature; foods that can reduce or eliminate cold syndrome are of warm-heat nature. It is generally believed that most cold and cool foods have the effects of clearing heat, purging fire, and detoxifying, and are often used for febrile diseases. Most of the warm and hot foods have the functions of warming the body, supporting yang, and dispersing cold, and are often used for cold diseases. Food with neutral properties has the functions of strengthening the spleen, appetizing, and replenishing the body.

Cold foods include: bitter melon, tomato, wild rice, water chestnuts, water chestnuts, lily, lotus root, bamboo shoots, sagittaria, konjac, water spinach, dandelion, Houttuynia cordata, purslane, bracken, Bitter greens, shepherd's purse, Chinese toon, water shield, snakehead fish, carp, river crab, mud snail, clam, razor clam, jellyfish, kelp, seaweed, snail, mussel, clam, milk, black bean, mulberry, sugar cane, pear, watermelon, persimmon, banana wait.

Warming foods include: ginger, scallions, coriander, which are suitable for symptoms such as colds, fever, aversion to cold, runny nose, headaches, etc.; dry foods suitable for abdominal pain, vomiting, and preference for hot drinks. Ginger, black tea; pepper, wine, etc. suitable for symptoms such as cold limbs, chills, rheumatic joint pain, etc.

Normal foods include: rice, soybeans, black sesame seeds, peanuts, potatoes, cabbage, cabbage, carrots, onions, black fungus, eggs, and fish including carp, crucian carp, loach, yellow croaker, and pomfret. In addition, the milk we drink daily is also a neutral food.

Cold foods include: buckwheat, corn, white radish, winter melon, mushrooms, celery, lettuce, rape, oranges, apples, etc.

Cold foods include: millet, mung beans, kelp, mung bean sprouts, bitter melon, tomatoes, cucumbers, bananas, watermelons, melons, etc.

Comprehensive?-

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