Conduct Your Own Nutrition Study
Help your child research how much protein he should consume in a day. Then, help him determine how much protein is found in the foods he eats. Have him keep a food journal for a few days and record how much protein he's getting in his actual diet. At the end of the study, ask him whether he's getting enough protein, and if not, what he can add to his diet to ensure that he takes in enough protein to maintain his muscle mass. As an extension activity, do the same thing with calcium. The more your child can relate nutrition to his actual food choices, the more likely he'll be to make wise decisions about what to eat.