Ranch Tuna Salad

1 large can white tuna
4 cups (12 ounces) multicolored rotini pasta, dry
2 cups bottled ranch dressing
1/2 cup diced red onion
1 cup diced celery
1 cup diced carrots (optional)
1 teaspoon salt
1/2 teaspoon pepper
1 (2 ounce) can olives, sliced and drained (optional)

Cook rotini pasta according to directions on package. Add remaining ingredients and mix thoroughly.

Makes 6 to 8 servings.