Why do different people require different amounts of food

Question

1. Why do different people require different amounts of food and therefore energy? Identify the daily recommended caloric intake for your age and sex.
2. Calories are simply a form of measurement. Choose your favorite food and provide the caloric information for 1 serving. Then provide an example of the amount of an activity needed to burn off that much energy.
3. What food groups are necessary for a balanced meal? How do you measure a portion?
4. Culture, personal experience and the environment impact human health. Provide an example of how children or adults make food choices unrelated to their body's needs?
5. Childhood obesity is an increasing problem in the United States. Propose a way to educate children about food choices and how food can impact their health.