Exceptions can be imported fruits such as banana, coconut, avocado, and other exotics. But they should not get involved, because fruits are processed for long transportation special gas, so it makes sense to take out their top layer.
Greenhouse vegetables are often treated with chemical fertilizers , growth stimulants and other harmful substances that can easily accumulate in the fruit, so that from the tomatoes and cucumbers in the winter is to give.
Buy foods in large supermarkets, where products are often being monitored for the presence of hazardous substances or farm markets. Do not take too large fruit, usually they are overfed fertilizers.