Sodium is as much of a culprit in maintaining health as is bad fats.
1 stalk celery, finely diced
1/2 an apple, finely diced
1/4 cup lime juice
3 radishes, finely sliced
10 slices cucumber
Lightly toss the first six ingredients together, carefully so the tuna is still a bit chunky.
Toss the arugula, tomatoes, radishes and cucumbers. Divide into two servings, if you please. Scoop the tuna mix evenly over the salad portions.
Note: 170g Albacore Chunk Light Tuna in Water drained weight is around 120g, which is higher than Canada's Food Guide recommended portion size for protein (75g). http://www.hc-sc.gc.ca/fn-an/food-guide-aliment/track-suivi/index-eng.php