Avocados Avocados are a great addition to a tuna salad, offering a creamy texture and a healthy dose of essential vitamins and minerals.  Not only that, but the monounsaturated fat found in avocados can help to improve heart health, while its high fiber content helps to keep digestion regular. 2. Tomatoes The juicy sweetness of tomatoes helps to balance out the richness of tuna, and they bring along plenty of antioxidants such as lycopene, vitamin C and beta-carotene.  Tomatoes also have anti-inflammatory properties that may be beneficial for overall health. 3. Apples Apples are an ideal complement to tuna salads because their crunchy texture adds contrast to each bite.  Additionally, apples are packed with vitamins A and C as well as dietary fiber—all important components of any balanced diet. 4. Oranges Oranges lend an unexpected zing to tuna salads when peeled and cut into wedges or cubes.  They're also excellent sources of potassium, which is important for regulating blood pressure and keeping your heart healthy. Plus, oranges contain plenty of vitamin C, which can help support your immune system. 5. Olives Olives offer an intensely flavorful addition to any type of tuna salad; they're also rich in antioxidants like polyphenols which can help protect against certain diseases such as cancer and diabetes.  In addition, olives contain monounsaturated fatty acids, which can help reduce cholesterol levels when consumed in moderation.