21 Day Fix~what are these color coded containers?

What do these color coded containers mean? They have changed my eating and I know think of food in terms of colors! Seriously, I first did the Fix last February when it was released and I haven't stopped using them since. 

Green~Veggies
Purple~Fruit
Red~Protein
Yellow~Carbs
Blue~Healthy Fats & Cheese
Orange~Seeds
Orange~Seeds

The key to success in the 21 Day Fix is to think within the containers! With your kit you receive 7 color coded containers. For the next 21 Days you will use these containers to portion and transport your meals. It makes meal planning a breeze!

In case you are wondering what the cup equivalents are:

Green~1 cup
Purple~1 cup
Red~3/4 cup
Yellow~1/2 cup
Blue~1/3 cup
Orange~2 tbsp
Orange~2 tbsp