anything wrong with pairing the toy with the food. our happy meals are healthy. so the calorie ranges anywhere from 380 calories up to around 700 calories. reporter: the idea that 700 calories for a 5-year-old is a healthy meal, i mean, that is debatable. well, if you go to the usda and look at the food pier rid, they will tell you that what a child needs changes based on whether that child is sedentary or whether that child is very active. so the range of options gives the parents the choice. so, it s not mcdonald s place to tell a parent, here s what you can serve to your child. reporter: bill whitman points out that customers can buy the toys without the food. and to many customers did you get a toy? reporter: the toy defines the meal. would you still like the happy meal if there were no toys in it? no. reporter: professor daniel cook studies the effect of advertising on kids.