Which of the following is a common concern associated with unwashed produce?

The presence of harmful bacteria and pesticides is a major concern when it comes to unwashed produce. Fresh fruits and vegetables can come into contact with various contaminants during their growth, harvest, transportation, and storage. These contaminants can include soil, water, wildlife, and agricultural chemicals such as pesticides.

Failing to wash produce before consumption can lead to foodborne illnesses caused by bacteria such as E. coli, Salmonella, and Listeria. Washing helps to remove surface dirt and can significantly reduce the load of these harmful pathogens, ensuring that the food is safer to eat. Additionally, washing can help minimize residues from pesticides that may have been applied during farming processes.

In contrast to this, nutritional loss, increased shelf life, and altered taste are not direct concerns tied to the act of not washing produce. Nutritional content is generally stable in unwashed fruits and vegetables, and washing typically does not affect their shelf life or taste in any significant way. Therefore, the concern over harmful bacteria and pesticides stands out as the primary reason why washing produce is essential for food safety.