Final answer:
A food worker must wash hands and change gloves before handling raw food, after using the restroom, and after touching their face or hair to maintain food safety.
Step-by-step explanation:
A food worker is required to wash their hands and change their gloves in several instances to maintain hygiene and prevent contamination. Specifically, they must do so in the following scenarios:
- Before handling raw food to prevent cross-contamination,
- After using the restroom to eliminate any fecal-oral route of pathogen transfer,
- After touching their face or hair to remove any transient microbes that may have been transferred to their hands.
All of these actions are critical in avoiding the transmission of foodborne diseases and ensure the safety of the food being prepared and served.