Final answer:
Nutrition labels are present on food products mainly because federal laws require them to help consumers make informed dietary choices.
Step-by-step explanation:
The main reason nutrition labels appear on food products is due to federal laws that require this information to help inform consumers. These laws mandate that packaged foods provide a nutrition facts label detailing the nutrient content per serving, as well as the ingredients. The presence of these labels helps people make informed decisions about their diet and choose foods that are aligned with their health goals, such as selecting options lower in sugar or higher in protein and fiber.