Which of the following is required to be included on all packaged foods?

The requirement to include nutritional content and an ingredient list on all packaged foods is fundamental for consumer safety and informed decision-making. This regulation, enforced by authorities like the Food and Drug Administration (FDA) in the United States, aims to provide consumers with essential information about what they are eating. The nutritional label typically includes details such as calories, fats, carbohydrates, proteins, vitamins, and minerals, helping consumers make healthier food choices. Additionally, the ingredient list ensures that consumers are aware of all components in the product, which is particularly important for those with food allergies or dietary restrictions.

While other options like the UPC code, manufacturer's name and address, and customer service contact information may often appear on packaging, they are not universally required for all packaged foods. The nutritional content and ingredient list are the core requirements aimed at promoting transparency and aiding consumers in understanding their food products better.