Final answer:
Hot food on a self-service buffet should be kept at a minimum of 140°F (60°C) to prevent bacterial growth and ensure food safety.
Step-by-step explanation:
The minimum temperature at which hot food should be held on a self-service buffet is 140°F (60°C). This temperature is important to maintain in order to inhibit the bacterial growth in food. Bacteria and microorganisms tend to multiply rapidly between 40°F (4°C) and 140°F (60°C), a range known as the 'danger zone.' To ensure the safety and prevent foodborne diseases, hot food must be kept above this 'danger zone.' Perishable foods left at these risky temperatures for more than two hours may become dangerous to eat due to the rapid bacterial growth.
For refrigerated foods, the temperature should be kept at or below 40°F (4°C) and freezer temperatures should be below 0°F (-18°C) to prevent bacterial growth. Regular handwashing, using a food thermometer to check the internal temperature, and proper storage are essential practices in preserving food safety.