Cook the pasta according to package directions, omitting salt and fat. Drain, and keep warm.
While pasta cooks, heat oil in a large nonstick skillet over medium-high heat. Add olives and garlic; sauté 2 minutes. Add tomato, pepper, and tuna; cook 3 minutes or until thoroughly heated.
Combine all the ingredients in a large bowl, and toss well.
Find recipes with ingredients that you have on hand.