Why is it advised not to wear jewelry or false nails during food preparation?

Wearing jewelry or false nails during food preparation is advised against primarily because they can become a physical contaminant. In a food preparation environment, any item that can dislodge from a worker's person and fall into food poses a significant risk of contamination. Jewelry such as rings, bracelets, and earrings can break or come loose, while false nails can chip or break off, both of which can introduce unwanted objects into food. This physical contamination can lead to foodborne illness or injury if consumed, thus highlighting the importance of maintaining a clean and safe food handling environment.

The other options provided do touch on important safety concepts, but they do not directly address the primary concern of physical contamination associated with wearing jewelry or false nails. For example, while jewelry and false nails might affect a person’s movement slightly, that is not the main reason for the guideline against them in food preparation settings. Additionally, the idea that they could cause food to spoil is not accurate in this context, and although it's possible for some materials to be damaged by food products, the emphasis in food safety practices specifically focuses on the risk of contamination.