What is a common sign of food contamination?

Unusual odors or textures are indeed common signs of food contamination. When food has spoiled or been contaminated, it often displays noticeable changes that can indicate the presence of harmful microorganisms or toxins. For instance, a sour or rancid smell may suggest bacterial growth or spoilage, while a slimy or mushy texture can indicate that the food is no longer safe to consume. These sensory signals are critical, as they can alert individuals to potential hazards even before tasting the food.

While color changes, spice residues, and temperature shifts can also provide some information about food quality and safety, they are not as definitive indicators of contamination. Color changes might occur due to natural ripening or exposure to air rather than spoilage, spice residue may simply indicate a preparation method rather than contamination, and temperature changes can happen for various reasons, not necessarily indicating that the food is unsafe.