When eating vegetables, the biggest concern is pesticide residue. Research has now shown that nearly 70% of malignant tumors are related to it. However, due to differences in growth cycles, pest situations, and other factors, the amount of pesticide used varies greatly among different vegetables. Which vegetables have more pesticide residue, and how can we remove it?
Generally speaking, leafy vegetables such as chives, cabbage, bok choy, spinach, and water spinach have relatively high levels of pesticide residue. This is because leafy vegetables are more susceptible to pests, and their short growth cycles mean pesticides don't have enough time to break down before they are brought to market. Chives are particularly prone to chive maggots, which often live at the base of the chives and are very difficult to kill. Sometimes, farmers use large doses of pesticides, even repeatedly applying highly toxic, persistent organophosphate pesticides through "root drenching" to achieve an insecticidal effect. At the same time, because chives are a continuously harvested crop, farmers often harvest and sell them before the safe interval for pesticide residue has passed to ensure freshness. These are the reasons why pesticide residue in chives is particularly severe. The chives that have been treated with highly toxic pesticides for "root drenching" often grow better, with lush, green leaves that look very appealing. When buying, do not be fooled by this illusion.
Cabbage, also known as kale, has a level of pesticide residue second only to chives, which is also related to its susceptibility to pests. There is a type of insect called the "borer," which, as its name suggests, bores into the innermost heart of the cabbage. To kill these pests, farmers have to use highly toxic pesticides for repeated "heart drenching," leading to increased pesticide residue. According to reports, many food poisoning incidents caused by vegetable pesticide residue have been caused by the consumption of chives and cabbage.
How should leafy vegetables be handled after purchase to minimize the intake of residual pesticides? Experiments have shown that to remove pesticide residues from the surface of leafy vegetables, you should first wash them with warm water 2-3 times, then soak them appropriately, wash them again, and finally cook them. This method can remove 80%-90% of the surface pesticide residues without destroying their nutritional value. For pesticides that have been absorbed by the vegetables, it is difficult to wash them away; they can only be reduced by extending the cooking time and using higher temperatures during cooking. Additionally, letting newly purchased vegetables sit for a day or two before eating will also help the pesticides degrade.