How to choose vegetables, the art of choosing vegetables
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Pesticide residues have always been a major social problem, but have not been well resolved. In recent years, there have been many cases of acute poisoning caused by vegetable contamination due to pesticide residues. Therefore, we should also pay attention to environmental protection when eating vegetables. As consumers, we should learn to avoid pollution to prevent diseases from entering the body through food. Do not eat vegetables with unusual shapes or colorsVegetables with normal shape and color are generally cultivated in a conventional way and not treated with hormones or other chemicals, so they can be eaten safely. "Abnormal" vegetables may have been treated with hormones, such as leeks. When its leaves are particularly wide and thick, 1 times wider than those of ordinary broad-leaved leeks, hormones may have been used in the cultivation process. Leeks that have not been treated with hormones have narrower leaves and a strong aroma when eaten. Some vegetables have abnormal colors, so you should also pay attention. For example, if the leaves have lost their usual green color and are dark green, or if edamame is abnormally emerald green, they may have been sprayed or soaked with methyl parathion pesticides before harvesting, so they should not be purchased. Some vegetables with abnormal shapes and colors are another matter if they are indeed new varieties after investigation.Do not eat vegetables with many insects or medicinesAmong the many vegetables, some are particularly favored by pests and can be called "vegetables with many insects"; some are not very popular with pests and can be called "vegetables with few insects". This is determined by the different components and specificity of the smell of vegetables. Among the vegetables with many insects, the "famous" ones include green vegetables, Chinese cabbage, cabbage, cauliflower, etc., while the vegetables with few insects include chrysanthemum, lettuce, celery, carrots, onions, garlic, leeks, green onions, coriander, etc. Vegetables with many insects have to be sprayed with pesticides frequently because of the large number of pests, which inevitably become heavily polluted "vegetables with many pesticides"; vegetables with few insects are the opposite and are relatively safe. In order to avoid excessive intake of pesticides, vegetables with few insects should be eaten as much as possible. However, in the cold season, since pests hibernate over the winter, the spraying of pesticides also stops, so it is okay to eat vegetables with many insects in small amounts. Some people have suggested that if there are many insect holes on vegetable leaves, it means that they have not been sprayed with pesticides and are safe to eat. In fact, this is unreliable. It should be noted that the insect holes on the leaves will increase as the leaves grow. A large number of insect holes can only mean that there was insect infestation in the past, not that pesticides have not been applied later.Do not eat vegetables that have been heavily fertilizedDue to the large amount of chemical fertilizers, especially nitrogen fertilizers (such as urea, ammonium sulfate, etc.), vegetables will be seriously contaminated by nitrates. Nitrates themselves are not very toxic, but they will be reduced to nitrites after entering the gastrointestinal tract of vegetables. Nitrite then combines with secondary amines in the gastrointestinal tract to form nitrosamines, which are carcinogens.Vegetables with nitrate contentAfter testing the vegetables on the market, it was found that the nitrate content was ranked from strong to weak as follows: root vegetables, potatoes, green leafy vegetables, cabbages, onions and garlic, beans, melons, solanaceous fruits, and edible fungi. The correlation between high and low nitrate content can be up to 10 times. The rule is that the pollution level of the roots, stems, and leaves (i.e., the vegetative body) of vegetables is much higher than that of flowers, fruits, and seeds (i.e., the reproductive body). This may be a protective reaction that is common in the biological world. This rule is very useful. It can guide us to consume vegetables correctly and eat as many melons, fruits, beans, and edible fungi as possible, such as cucumbers, tomatoes, edamame, and shiitake mushrooms. If you like to eat leafy vegetables, don't be too hard on yourself. Just make sure to supplement some vitamin C, because vitamin C can block the formation of nitrosamines and reduce the potential dangers of leafy vegetables. |
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