Review of the 12 Dirtiest vs. Cleanest Fruits and Vegetables
[Introduction] When buying produce, people must not only consider freshness but also be mindful of which vegetables are safe and whether pesticide levels are excessive. The U.S. Department of Agriculture (USDA) and the U.S. Food and Drug Administration (FDA) have released rankings of the "12 Dirtiest" and "12 Cleanest" fruits and vegetables for public reference.
The 12 Dirtiest Fruits and Vegetables vs. The 12 Cleanest
Which Vegetables Are Safe
After analyzing nearly 43,000 test results on agricultural products from the USDA and FDA, the non-profit organization EWG (Environmental Working Group) published the "12 Dirtiest" and "12 Cleanest" fruits and vegetables.
The 12 fruits and vegetables with the most severe pesticide contamination (ranked by contamination severity, with the first being the dirtiest):
Peaches, Apples, Sweet Bell Peppers, Celery, Nectarines, Strawberries, Cherries, Pears, Imported Grapes, Spinach, Lettuce, Potatoes.
The 12 fruits and vegetables with the least contamination (ranked by cleanliness, with the first being the cleanest):
Onions, Avocados, Frozen Sweet Corn, Pineapples, Mangoes, Asparagus, Frozen Peas, Kiwis, Bananas, Cabbage, Broccoli, Papayas.
These results indicate that consumers can reduce their pesticide intake by nearly 90% by avoiding the "dirtiest" produce. People who eat the 12 dirtiest fruits and vegetables ingest an average of 15 different pesticides daily, whereas those who eat only the 12 cleanest ingest an average of no more than 2 types of pesticides per day.
Experts suggest that when purchasing fruits and vegetables on the "12 Dirtiest" list, it is best to buy organic products. If organic options are unavailable or too expensive, be sure to wash them thoroughly before consumption. Proper washing can reduce pesticide intake by one-third to one-half.
Severe Pesticide Contamination in Produce
In recent years, the exposure of incidents like Sudan Red, hair soy sauce, clenbuterol, toxic rice, and gutter oil has sparked public reflection on food safety issues in China. The problem of pesticide residues in fruits and vegetables has now reached a level requiring serious attention from relevant departments.
The Ministry of Agriculture once investigated pesticide residues in agricultural and livestock products across 24 provinces and cities. The results showed that vegetables and eggs were the most heavily contaminated, with residue rates of 33.1% and 22.15%, respectively. China's annual pesticide usage is around 500,000 tons, of which 30% is absorbed by crops, and 350,000 tons flow into rivers and enter the human food chain. Furthermore, various additives used in food processing are extremely harmful chemical substances to the human body. In recent years, incidents of pesticide poisoning and export inspection failures and penalties have frequently been reported. Nationally, there are over 100,000 cases of acute pesticide poisoning annually. The following data is concerning:
In 2001, the Ministry of Health received 185 reports of food poisoning, affecting 15,715 people and resulting in 146 deaths. In 2006, the Ministry of Health received 596 reports of food poisoning through the China Center for Disease Control and Prevention's direct reporting system, affecting 18,063 people and causing 196 deaths, including 17 incidents involving more than 100 people. In 2007, on September 12, the Ministry of Health reported that in August alone, a total of 130 public health emergencies were reported nationwide (excluding Hong Kong, Macao, and Taiwan), involving 4,929 cases and 54 deaths. The widespread use of pesticides in rural areas to increase crop yields is a major reason for the high pesticide residues in fruits and vegetables.
Pesticide residues in produce can cause acute and chronic poisoning in humans, leading to hazards such as cancer, deformities, and mutations. To avoid these risks, people often use simple disinfection methods: soaking in clean water, alkaline water soaking, high-temperature treatment, washing with diluted detergent, and sun exposure. However, these methods are not very effective at removing pesticide residues. Research shows that rinsing with boiling water can lead to a loss of over 50% of nutrients, using disinfectants can easily cause secondary pollution, and sun exposure is time-consuming and not very effective.
Eating Fruits and Vegetables Worried About Pesticides? Experts Teach You 5 Tricks
Trick 1: Don't Eat Fruits and Vegetables Right After Buying Them
Many consumers might find this strange. The appeal of vegetables is their freshness; eating them after a few days might not be as tasty. However, to adhere to the "pre-harvest interval" rule, consumers should give the vegetables they buy a few extra days of a "safety period."
In cooler seasons when vegetables are less likely to spoil, after buying fruits and vegetables, it's a good idea to let them sit in circulating air for a few days. This is especially true for green leafy vegetables like cabbage, napa cabbage, and chives, as it can accelerate the natural decomposition of pesticide residues. In the cold winter, many vegetables won't spoil even if left outside for a few days, so this method can be used more frequently. In warmer seasons, if there's a concern about spoilage, they can be refrigerated for a few days in a well-ventilated space, which can also help the volatilization of pesticide residues.
Trick 2: Don't Blindly Believe Vegetables With "Worm Holes"
To eat vegetables without pesticide residues, many consumers prefer to buy green leafy vegetables and cowpeas with worm holes, believing such produce must not have been sprayed with pesticides. The presence of worm holes is not a standard for whether pesticides were used. After buying vegetables with worm holes, consumers rarely find actual worms in them. Farmers do not manually remove pests; instead, they use pesticides to eliminate them after an infestation occurs.
The pesticides used on vegetables with worm holes kill adult insects, whereas those without worm holes kill larvae or eggs. It's also important to note that adult insects have greater resistance than larvae, so the pesticide dosage might be higher. Furthermore, adult insects appear later than larvae, meaning the pesticide application time for vegetables with worm holes is closer to the harvest date, resulting in less decomposition and higher residue. In conclusion, consumers should not blindly hold onto the traditional belief that "worm holes mean no pesticides."
Trick 3: Special Detergent Is Not as Good as Blanching in Boiling Water
Washing fruits and vegetables is crucial. Effective washing can remove about 95% of bacteria, 60% of pesticide residues, and almost all parasite eggs.
For easily broken and bruised green leafy vegetables, soaking is the recommended method, which involves soaking in water for about 30 minutes. To enhance pesticide removal, a professional detergent can be used to prepare the soaking solution. However, it should be noted that most common detergents on the market claiming to remove pesticides are not very effective. It is advisable to consult agricultural experts for specific detergents that can help. In fact, blanching in boiling water before washing is more effective than many detergents. For chives, for example, they should be repeatedly soaked 3 to 5 times for 10-15 minutes each, and then blanched in boiling water.
However, to further remove bacteria and microorganisms, rinsing after soaking is necessary, especially for overlapping root areas, which should be separated and rinsed, and each leaf must be washed individually. For leafy vegetables with smaller leaves, such as spinach, crown daisy, chickweed, and bok choy, the roots can be cut off, and then the vegetables can be rinsed root-side-up under a faucet to use the water's force to remove pesticide residues.
In addition, for harder vegetables like cucumbers and potatoes, besides the above methods, they can be further scrubbed with a brush.
Trick 4: It's Better to Peel Fruits
For fruits, besides thorough washing, it's best to peel them before eating. Many fruits, such as apples and pears, have a waxy surface on their skin that can prevent pesticides from entering the plant's interior. Therefore, by simply removing the skin before eating such fruits, most pesticide residues can be avoided.
For example, to reduce growth cycles and get to market faster, producers of fruits like tomatoes, cucumbers, and strawberries often use pesticides such as plant growth regulators to force ripening. It is advisable not to buy fruits that are overly large or have abnormally bright colors.
Trick 5: Don't Just Seek "Pretty" Vegetables When Shopping
When buying vegetables, some that look a bit misshapen might actually be healthier than their larger, more vibrant counterparts. Don't be too greedy for appearance when shopping; it's better to buy average-sized and shaped vegetables. Vegetables that have been overused with hormones and pesticides often have altered appearances, such as unnaturally large, oddly colored tomatoes, potatoes, or cucumbers. Vegetables like onions, fennel, cilantro, and chili peppers have strong flavors, so they generally have fewer pests and lower pesticide residues, so there's no need to worry too much when buying them.
Another principle is to choose high-quality vegetables with clear origins and labels. High-quality vegetables are fresh, tender, well-shaped, with a moist and shiny surface, no yellow leaves, no damage, no pests, no diseases, and no rotten spots. According to the control and use of pesticides and fertilizers during the production process, vegetables in China can currently be classified into four categories: organic, green, pollution-free, and uncontrolled. When possible, it is recommended to purchase the first three. Uncontrolled vegetables usually have no labels, but this does not necessarily mean they are unsafe; however, products with labels offer greater assurance.
Special Reminder: Soaking Vegetables for "Too Long" Increases the Risk of Carcinogenic Nitrites
Don't Soak Vegetables for Too Long
In fact, soaking vegetables for a long time before washing does not effectively remove pesticide residues and can even increase the levels of the carcinogen nitrites.
Long-term soaking of vegetables increases nitrite content. A study by Anhui Agricultural University found that after 20 minutes of soaking in clean water, the nitrite content in vegetables was higher than in those washed with detergent and then rinsed clean. The study suggests that this might be because soaking creates an anaerobic condition that enhances the activity of nitrate reductase and reduces the activity of nitrite reductase, thereby increasing nitrite levels in the vegetables. Finally, prolonged soaking can also cause vegetable leaves to break down, leading to greater nutrient loss.
Many experts warn that nitrites in vegetables may be more harmful than pesticide residues. Due to the excessive use of nitrogen fertilizers, the nitrate content in vegetables is often high, which, when converted to nitrites, can become a potential carcinogen.