How to combine different food groups?

How to combine the different food groups in a healthy way? Simple! Look at this simple example of a menu:
Breakfast: 2 slices of whole grain toast, tuna without mayonnaise. Add lettuce, tomato. Make a tuna sandwich with this and drink a glass of natural orange juice.
Snack: a good piece of watermelon.
Lunch: sweet potato, turkey, salad made of lettuce, corn, and spinach.
Snack: Plain greek yogurt with almonds.
Dinner: Grill salmon with boiled broccoli and carrots.
*** The idea is to play with the different food groups and make smart combinations.

This way you can a different meal every day