Which option is NOT listed as a factor used to determine best-by dates?

• A. Time
• B. Quality
• C. Temperature
• D. Color

Answer: (D)

Best-by dates are set based on how quickly quality can change under normal storage. Time is the fundamental driver—how long the product has been produced—because longer exposure generally leads to more quality loss. Temperature matters because storage conditions speed up or slow down chemical reactions, microbial growth, and texture changes that affect quality. The quality criterion itself is about maintaining the product’s intended taste, texture, aroma, and appearance, using objective standards during testing.

Color is not used as a direct factor to determine the date. It can signal quality changes, but color alone isn’t a consistent, universal measure across different foods, and some items may change color without becoming unsafe or dropping below quality standards. Therefore, it isn’t relied on when setting a best-by date; instead, time, how storage temperature affects quality, and objective quality attributes are the factors considered.