Kids look to their parents for wisdom and direction. They model their behavior after their parents. If you look both ways before crossing a street, so will your kid. If you put your pants on one leg at a time, so will your kids. If you bathe yourself everyday, after much posturing and whining, eventually, so will your kid.
Exercising good judgement about what food to eat should be no different. Most kids like chicken nuggets. Besides being highly processed and being made up of more saturated fat than protein, most chicken nuggets are coated with refined wheat flour. Commercial wheat flour is made from wheat that is particularly dense in carbohydrates, is high in glycemic index, and processed to the point where any retained fiber loses all beneficial properties.
Instead of giving your kids a processed chicken nugget, consider using a healthier flour such as almond flour/meal. Made from nuts, almond flour is much lower in glycemic index than wheat flour. Add spices to your almond meal to make a healthy homemade chicken nugget off the adult menu that your kids will enjoy too.