Before introducing this assignment, I go to the FDA website on evaluating food labels: http://www.fda.gov/food/ingredientspackaginglabeling/labelingnutrition/ucm274593.htm
Each student brings in a food product label from a food that they typically eat at home such as a box of granola bars, yogurt cups, macaroni and cheese, etc. Drink labels can be evaluated as well, but there's not much to evaluate due to their generally low nutritional content. Once the student gets the general idea after seeing the website, they can use this assignment to evaluate their own food labels from home. The students love this! There are questions such as "If there was a low calorie or reduced fat version of your food, would you choose that instead and why?" This assignment also includes evaluating the time it takes for food to travel through the digestive system by looking at a full-color picture and a timetable.
I always have food labels on hand for those students who forget to bring theirs in. Answers will vary depending on the different foods being evaluated; however, the answers to the questions on the time it takes for food to travel through the digestive system should all be the same. The KEY reflects this.