Wild vegetables: Be cautious of poisoning when eating wild vegetables

Due to being tired of rich meats and everyday vegetables, or distrust in current food safety, more and more people have taken to eating wild vegetables. Also, because the prevailing notion is that wild vegetables offer health benefits, they have started appearing in many rural restaurants. Especially for outdoor enthusiasts such as hikers, picking and consuming natural wild vegetables is especially popular. However, although wild vegetables are delicious, there are significant safety risks associated with eating them. In 2011, three hikers in Shenzhen died of poisoning after eating wild vegetables for sustenance in the deep mountains; this July, a family in a villa community in Changping District, Beijing, was poisoned after eating self-grown wild vegetables. The succession of wild vegetable poisoning incidents has drawn attention to the risks of eating them. When a table full of lavish wild vegetable dishes is set before you, do you know how to pair and eat them to truly gain their health benefits?

One day this July, a couple in Beijing mistakenly picked and consumed the tender shoots of black nightshade, thinking they were amaranth, which led to symptoms such as vomiting, blurred vision, and unsteadiness. They were rushed to the hospital by relatives and their lives were saved.

Doctors explained that properly prepared black nightshade can clear heat and detoxify, treating colds, fevers, and bronchitis. Its berries and leaves are edible, but the leaves contain high levels of alkaloids and must be thoroughly cooked to neutralize the toxins. While high-temperature cooking can reduce some of the inherent toxicity of wild vegetables, not all are suitable for stir-frying. For example, andrographis should be eaten cold, while elm seeds are better steamed or made into sauces. Most wild vegetables are cold in nature and bitter in taste, helping to reduce internal heat, but overconsumption can harm the spleen and stomach, causing mild poisoning symptoms such as nausea and vomiting. No matter what kind of wild vegetable it is, they should not be consumed in large quantities or over long periods.

Although wild vegetables are favored, controversies surrounding them continue. Zhang Baohai, a vegetable expert at the Beijing Academy of Agriculture and Forestry Sciences, said: “Picking wild vegetables is certainly a joy, but mistakenly eating toxic ones may be life-threatening.” He warned that the “nature” of wild vegetables lies in their “wildness,” so one must be very selective when foraging. Many wild vegetables contain certain toxins or substances harmful to health. Therefore, never consume wild vegetables that are unfamiliar, unclear in origin, or of unknown source. Avoid picking wild vegetables growing on grasslands near industrial wastewater discharge areas or along roadsides, as these may be contaminated by polluted water or car exhaust, leading to high levels of heavy metals such as mercury and lead, as well as other harmful substances. Wild vegetables near lawns or farmland should also be avoided, as pesticides are often sprayed to prevent pests and diseases.

“In addition, there is a lot to consider when eating wild vegetables,” Zhang Baohai said. Different wild vegetables have different preparation methods. Some are suitable for raw consumption, such as sow thistle and dandelion; others like shepherd’s purse and purslane are better cooked. Some wild vegetables are slightly toxic, such as Chinese yam leaf, which must be soaked in clean water for more than two hours before cooking to reduce toxicity. Although most wild vegetables are more nutritious than cultivated ones, they should not be eaten in excess and certainly not as a replacement for regular vegetables. Wild vegetables often contain high levels of oxalic acid, and overconsumption may affect calcium absorption. Most wild vegetables have certain medicinal properties, but since the effects vary, mixing them may cause adverse reactions due to conflicting effects, which not only fails to nourish the body but may also harm health. Moreover, avoid taking wild vegetables together with medication. Those who regularly take painkillers, sulfonamide drugs, or have allergies should be particularly cautious when eating wild vegetables.
Here we urge all outdoor enthusiasts to correctly understand the health knowledge related to wild vegetables, properly forage for them, cook them, and pair them, so that your wild-flavored meals can truly be delicious.

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