Nowadays, more and more people pay attention to the pollution of agricultural chemicals about vegetables and fruits. Generally speaking, many kinds of foods can be polluted by agricultural chemicals. When people are washing vegetables and fruits, they must be rather careful to remove the left toxic substances. According to the experts, most of the toxic substances can be left in the stem and base of plants. Therefore, it is beneficial for people to remove these parts so as to decrease the danger. Generally speaking, four skills can help people eat fruits and vegetables safely. 

The first skill is to put fruits and vegetables aside for several days before people eat. It has already become a habit for people to eat fresh foods. However, more and more experts advise people to put fruits and vegetables aside for several days before people eat. Thus, the left chemicals can be dissolved naturally. In order to protect the foods, people can put the foods in icebox.

The second skill is to avoid the vegetables with worm channel. Many people like to choose the vegetables with worm channel, as they think these vegetables are not polluted by toxic substances. In fact, the existence of worm channel can not judge whether agricultural chemicals have been used or not. Nowadays, drug fastness of worms has been greatly increased. Oppositely, more agricultural chemicals have been used to kill the worms.

The third skill is to use boiled water to wash vegetables and fruits. According to the experts, if people wash the foods effectively, about 95% of bacteria and 60% of left agricultural chemicals can be removed. Many people like to use detergent in daily life. In fact, it is more beneficial for people to wash the foods in boiled water. The vegetables like cucumber and potatoes can be scrubbed with a brush.

The fourth skill is to remove the peel before people eat. In order to stop chemicals entering the inside of the plants, a kind of wax has been applied to the peel of fruits. Therefore, it is necessary for people to remove the peel to avoid the danger of chemicals. In addition, some unbeneficial substances can be produced in the fruit peel. For example, tannic acid can be contained in the peel of persimmon. Under the action of gastric acid, tannic acid can be acted with protein contained in the foods to produce persimmon stone which can further cause various diseases.