What signs indicate food is spoiled and should not be consumed?

The signs of spoiled food primarily include off odors, discoloration, and a slimy texture. Each of these indicators points to potential microbial growth or chemical changes in the food that make it unsafe to consume.

Off odors are usually a clear indication of spoilage, as they can signal the presence of bacteria or mold that can produce harmful toxins. Discoloration indicates that the food is no longer fresh, and it may have undergone oxidative processes or microbial action. A slimy texture often suggests the presence of bacteria that can lead to foodborne illnesses. These characteristics are critical for identifying food that has gone bad and should not be eaten to prevent health risks.

In contrast, bright colors and strong smells may not always indicate freshness. A slightly firm texture and good smell can be misleading if other spoilage signs are present. No odor and a bright appearance may suggest food is in good condition, but it does not guarantee safety if the food has been improperly stored or has exceeded its shelf life. Thus, option A encapsulates the primary signs of food spoilage accurately.