After you have completed the 21 day reset, you don't want to go back to old eating habits. When doing a lifestyle change, you'll want to find new ways of eating.
The 21 Day Meal Plan focuses on limited food choices to keep it simple and not adding extra salt to your food to help you learn how to start using less salt.
This is step 2 which will welcome in more fruits, veggies, starches and other yummy things to move towards a permanent lifestyle change.