What is the primary function of a food thermometer?

The primary function of a food thermometer is to ensure food is cooked to a safe internal temperature. This is crucial for food safety because certain pathogens present in food can only be eliminated when it reaches specific temperatures. By using a food thermometer, cooks can accurately determine whether the food has reached a temperature that is sufficient to kill harmful bacteria, viruses, and parasites, thus preventing foodborne illness. This practice is especially important for meats, poultry, and fish, which have recommended internal temperatures that must be met to ensure safety.

Other options, while pertinent to food handling, do not specifically relate to the main function of a food thermometer. For instance, measuring food portion sizes, checking freshness, or monitoring weight are not the intended uses of a thermometer in food preparation. The primary role is firmly rooted in cooking safety, making the correct answer vital for effective food protection practices.