If you are a parent, what is personal development for you? How will you apply this to your kids? Will this have to do with their behavior with others in school or their reaction to the food that are served to them? Some children may be given the power to choose the food that they want while some eat what is served on the table- Kudos to those kids. 
If you would like to train your child on eating healthy, you need a food pyramid guide. Take a look at this food pyramid guide as an example designed by the US Department of Agriculture.
For 9 to 18 year olds, this list is what they should consume in a day:
* 5-7 oz. of Grains
* 2.5-3 cups of Vegetables
* 1.5-2 cups of Fruits
* 3 cups of Dairy Products
* 5-6 oz of Protein
For the younger kids around 2-8 year olds, they must consume the following in a day:
* 3-5 oz. of Grains
* 1-1.5 cups of Vegetables
* 1.5 cups of Fruits
* 2 cups of Dairy Products
* 2-4 oz of Protein
The list that you see above is the easiest way to remember if your kids are consuming enough or too little of the essential food groups. It is your gauge to know if your kids are getting the right amount of nutrition on a daily basis. The nutrition facts of most food purchased at the grocery is seen in the back label. So this pretty much can help you determine if how much of that food must be served.
Whole grain foods are whole wheat bread, oatmeal, whole wheat pasta and brown rice. In case your child doesn’t drink milk too much, and yet they need to consume 2-3 cups of calcium, then try to get them to eat yogurt instead. Aside from yogurt, cheese and fresh orange juice is a good.
On the other hand, if they do like milk, try buying them skim milk by the time they reach three years old. This will make them leaner.

