Great question!

Everyone is different when it comes to how much their body needs to be satisfied and function properly. No two people will always need the exact same amounts of food.

In general, men and very active individuals will have higher food needs than women and inactive/moderately active individuals. And our needs will change depending on our activity for the day.

On days that you don't train or do much activity, you will probably not feel as hungry. That doesn't mean you need to restrict calories - it just means you might not need 5-6 meals a day. 

It's always best to listen to YOUR body because you know it best - if you eat the designated portions in a meal plan and still feel hungry or are having cravings at the end of the day, that means you didn't eat enough. 

Use my meal plans as a guideline and increase the portions as necessary depending on your personal needs.

Here is a great infographic from Precision Nutrition that will help you get started with portion control.