1: 1. Opt for whole grain bread for extra fiber and nutrients. 2. Mix tuna with Greek yogurt instead of mayo for a protein boost.

2: 3. Add crunchy veggies like celery and cucumber for texture. 4. Sprinkle in some fresh herbs like dill or parsley for flavor.

3: 5. Consider adding in some chopped nuts or seeds for added crunch. 6. Don't forget a squeeze of lemon juice for a pop of brightness.

4: 7. Experiment with different seasonings like paprika or cayenne for a kick. 8. Layer on some avocado slices for extra creaminess and healthy fats.

5: 9. Instead of traditional lettuce, try using leafy greens like spinach or arugula. 10. Consider serving your tuna salad on a bed of mixed greens for a low-carb option.

6: 11. Don't be afraid to get creative with your sandwich fillings. 12. Consider adding in some dried fruit like cranberries for a sweet touch.

7: 13. If you're feeling adventurous, try adding in some pickles or olives. 14. Consider using a high-quality olive oil instead of mayo for a healthier option.

8: 15. Don't overlook the power of a good quality mustard or hummus as a spread. 16. Try serving your sandwich open-faced for a lighter, lower-carb option.

9: 17. Finally, don't forget to season your tuna salad well with salt and pepper. 18. Enjoy your ultimate tuna salad sandwich and start your day off right!