Which of the following is a sign of food spoilage?

The presence of both unusual odors and color changes are key indicators of food spoilage. When food spoils, it undergoes chemical and microbial changes that can result in off-putting smells and alterations in its color. Unusual odors often arise due to the activity of bacteria or fungi breaking down the food, leading to the production of volatile compounds that are detectable by our sense of smell. Likewise, color changes can signal the deterioration of food; for instance, fresh produce may turn from vibrant colors to dull shades or even develop dark spots as it spoils. Both of these signs together provide stronger evidence of spoilage, making it essential for food safety to recognize them promptly. This understanding is crucial in maintaining a safe culinary environment and ensuring the quality of the food served.