Which of the following factors helps prevent food contamination by food handlers?

Washing hands before returning to work after smoking is crucial in food safety to prevent food contamination. When food handlers smoke, their hands can come into contact with various contaminants, including nicotine and bacteria. By thoroughly washing their hands afterward, it significantly reduces the risk of transferring those contaminants to food. This practice aligns with proper hygiene protocols which are essential in maintaining a safe food environment.

The other options present practices that could increase the risk of food contamination. Smoking while handling food introduces harmful substances directly into the food preparation area. Handling food without gloves does not provide a barrier against potential pathogens on the hands, thereby increasing the likelihood of contamination. Returning to work after illness without proper approval poses a risk to food safety, as ill individuals may carry pathogens that could contaminate food and cause illness in others.