The weather has warmed up, the trees have begun to sprout, and the grass has begun to turn green. Many friends have begun to carry small baskets and shovels everywhere to dig wild vegetables to taste fresh. In addition, it is not clear whether it is a paragraph, and there is a netizen in a state of isolation who issued the following sigh...
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I want to eat some fresh vegetables, but wild vegetables can not be eaten casually, in addition to possible pesticides and other pollution, some wild vegetables will really "die".
01
The wild vegetables you dig up may be "poisonous vegetables"
There are certain safety hazards behind the wild vegetable fever, because most people dig wild vegetables in parks, farmland, hillsides, woods, roadsides and other places, and the wild vegetables in these places and their growth environments have not been tested, not only may there be excessive herbicides and pesticide residue pollution.
Domestic garbage, passing car exhaust, wastewater exhaust gas discharged by factories, etc., may pollute the soil and wild vegetables themselves, which in turn will lead to excessive harmful substances in wild vegetables, and if improperly handled, they may endanger health.
Taking lead as an example, a study detected the content of lead and cadmium in 90 wild vegetable samples of Maran, Chinese cabbage and cress in 8 regions of Zhejiang Province, and found that the heavy metal lead content of 3 kinds of wild vegetables exceeded the standard by 56.7%, which will vary from region to region. [1]
If the human body's lead intake exceeds the standard, it will mainly damage the hematopoietic system, nervous system and kidneys. There will be adverse symptoms such as metallic taste, abdominal pain and diarrhea, palpitations, hyperactivity, inattention, insomnia, dreams, fatigue, and memory loss.
Figureworm creative
In addition to lead, many other toxic substances may also accumulate in wild vegetables, and some public places in the green area, because the plants here are used to see rather than eat, so spraying pesticides and other pesticides may be more frequent, in this kind of place to dig wild vegetables, pesticide content can be imagined.
In addition, although digging wild vegetables is a wild interest for people, it is not fun at all for the environment, because the small shovel is shoveled all the way down, coupled with people's stampede, it is easy to make the vegetation and soil a mess. This practice, if it is in the wild, is to destroy the local ecological environment, in the park is to trample and destroy the lawn, are uncivilized behavior.
Therefore, we can walk on the green in the spring, but don't bring a shovel, if you like to eat wild vegetables, you can choose a regular supermarket to buy, there is a professional quality control, eat more assured.
02
These 2 wild "vegetables" cannot be touched:
As mentioned above, all wild vegetables that are dug up by themselves and have not been quality controlled may have health risks when eaten. The following two are simply poisonous.
1. Wild celery:
Wild celery | Figureworm creative
Wild celery, also known as big leaf celery, often occurs in the northeast of the mainland where wild celery is poisoned by mistake, and the toxic ingredients are celery, methyl celery and celery toxin [2].
After consumption, it causes arrhythmias, nausea, vomiting, blurred vision, numbness throughout the body, and severe death. Grows mainly in wet places, with leaves like celery leaves, flowering in summer, and the whole plant is poisonous and accompanied by a foul odor.
2. Cang'er:
A kind of | Figureworm creative
I still remember a few years ago there was a news: a parent picked his own ear decoction water to treat his child's rhinitis caused poisoning, resulting in liver damage to the child into the ICU treatment.
Cang'er zi raw products have a certain degree of toxicity, and food poisoning will cause damage to the liver when consumed, which can be serious and fatal. Cang'er needs to be concocted to reduce its toxicity as a Chinese medicinal herb. [3] In addition, many so-called folk remedies or medicinal plants that are improperly used can pose dangers, such as cases of poisoning caused by misuse of mandalas. [4]
Like the ear may be good to distinguish, wild celery is often misunderstood, every year there are people poisoned, so if we want to eat wild vegetables or go to the supermarket to buy it, safe and assured.
03
What are the nutrients for the wild vegetables that can be bought?
With the demand for wild vegetables, artificial planting and sales are simply too normal, after all, we even get the lunar soil specimens, we must first care about whether we can grow vegetables... The following is a brief introduction to the wild vegetables that can be seen in supermarkets and their nutritional value.
1. Dandelion:
The dandelion's small yellow flowers and hairballs are all too familiar to everyone, so here is a picture of its status on the board | Figureworm creative
This is a wild vegetable that everyone is familiar with, and it tastes very bitter, and the bitterness mainly comes from choline and picrinin. Studies have shown that dandelions also have certain medicinal properties. [5、6]
In terms of nutritional content, the vitamin C content of fresh dandelion leaves is higher at 47mg/100g, which is 1.3 times that of vitamin C in Chinese cabbage that we often eat. Many people in life will eat dandelions raw, which can better preserve vitamin C. [7]
Dandelion vitamin B2 is also more prominent, of which the vitamin B2 content of the leaves is 0.39mg/100g, and the vitamin B2 content in the flower buds is higher than that of other organs, which is 1.57mg/100g.
Usually, our diet is easily deficient in vitamin B2, and symptoms such as seborrheic dermatitis, fatigue, angular cheilitis, and conjunctival hyperemia of the eyeball will occur [8]. Eating 100g of dandelion leaves can meet 32.5% of an adult woman's daily vitamin B2 needs.
2. Cabbage:
Lettuce | figure worm ideas
Cabbage is a delicacy that many people like, especially the dumplings used to make pork stuffing with cabbage, wontons, and tofu soup, not to mention how delicious it is.
The cabbage is not only delicious, but also very nutritious. It has a prominent content of vitamin C, mineral calcium, and β carotene.
The vitamin C content of cabbage is similar to that of dandelions, and eating 200g can meet 86% of the daily vitamin C requirement. Its calcium content is higher than that of milk, which is 2.7 times that of milk. β carotene content is also good, 2590 micrograms / 100 grams, nearly 3 times higher than the dark vegetable pumpkin, which is beneficial to eye health. [7]
However, the oxalic acid content of cabbage is high, so you must blanch water before eating. Boil the pot under water, the water should submerge the cabbage, blanch the water for 1 minute.
3. Purslane:
Purslane | Figureworm creative
Purslane is a relatively common wild vegetable, the taste is more special, but also has a certain medicinal value. [9]
In terms of nutritional value, purslane's β-carotene is more prominent, 2230 μg/100 g, and contains oligosaccharides, which can improve intestinal health.
4. Mugwort:
Mugwort | Figureworm creative
Mugwort, also known as wormwood, is generally used to make green balls during the Qingming Dynasty, and has a special fragrance.
Mugwort is more prominent nutrition is dietary fiber, mineral calcium and potassium, its dietary fiber content of 3.6g / 100g, than the green leafy vegetables we often eat such as cabbage, leeks, spinach, hollow cabbage, etc. are high, can promote gastrointestinal peristalsis, prevent constipation, beneficial to intestinal health. [7]
Its potassium content of 677mg/100g is 2.6 times that of bananas, which is still relatively friendly to people with high blood pressure. As for its calcium content, although it is also quite high, 137mg/100g, it also contains tannic acid that affects calcium absorption, and it needs to be blanched with boiling water before eating.
5. Toon:
Toon | Figureworm creative
Toon is a favorite of many people, the most common practice is toon scrambled eggs, toon sprouts mixed with tofu, cold mixed toon and so on.
Compared with the Cabbage we often eat, its vitamin C, carotene, magnesium, calcium, iron content is 1.1 times, 8.8 times, 3 times, 1.7 times, 4.9 times that of Chinese cabbage, and the dietary fiber of toon is 2 times that of Chinese cabbage, which is very helpful for preventing constipation. [7]
However, the nitrite content of toon is not low, and studies have shown that the average nitrite content after toon cleaning is 160.55 mg/kg. After blanching in boiling water at 100 °C for 30 seconds after 48 hours, the average nitrite content was 14.29 mg/kg. And the storage time of toon with the extension of storage time of nitrite content showed an increasing trend, storage time of 48 hours is 2.6 times the storage time < 24 hours. [10]
The nitrite range of common Chinese cabbage is 0 to 11mg/kg [11], compared to the nitrite of toon is really not low. Excessive intake of nitrites poses health risks, so it is recommended to blanch water before eating.
To summarize:
Although wild vegetables taste delicious, but on the one hand, self-mining is uncivilized, on the other hand, it may ingest harmful substances to affect health, and there may be a risk of poisoning.
Author | Xue Qingxin Member of Chinese Nutrition Society Registered Nutrition Technician Health Manager Public Dietitian
Audit | Wang Kang, Director of Science Popularization Center, Beijing Botanical Garden, Professor-level Senior Engineer
Editor-in-charge | Ding Song
This article is produced by the "Scientific Rumor Dispelling Platform" (ID: Science_Facts), please indicate the source when reprinting.
This article is from the copyright gallery of images and is not reproduced with permission.
bibliography:
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