Protein, calories, and fat: both are strong choices

Tuna and turkey are both high-quality sources of protein, which helps with muscle repair, satiety, and maintaining lean mass. In general, plain canned light tuna and skinless turkey breast are both high-protein, relatively low-calorie foods. That makes either one a smart pick if you’re trying to build balanced meals.

Turkey breast is usually the lower-fat, lower-calorie choice per serving, especially when compared with fattier tuna preparations or tuna packed in oil. Tuna can still be very lean, but the numbers shift depending on the species and packaging. If you want the simplest “lean protein” answer, turkey breast often wins on calories and fat.

The biggest difference: mercury vs. sodium

The main nutritional advantage of tuna is also its main caution: mercury. Larger, longer-lived tuna species, especially albacore and bluefin, can contain more mercury than smaller fish. That matters most for pregnant people, nursing parents, and young children, who are often advised to choose lower-mercury seafood more carefully. Light tuna generally has less mercury than albacore.

Turkey does not raise mercury concerns, but processed turkey products can be very high in sodium. Deli turkey, lunch meat, and seasoned turkey patties may look lean on paper but can deliver a lot of salt. If you’re comparing tuna salad to deli turkey sandwiches, the winner depends heavily on how much mayo, salt, and processed meat is involved.

Vitamins, minerals, and other health benefits

Tuna is a standout source of vitamin B12, selenium, and, in some varieties, omega-3 fats that support heart and brain health. Those omega-3s are a meaningful point in tuna’s favor, especially if you don’t eat fatty fish often. USDA nutrient data and NIH guidance on omega-3s support seafood as a valuable part of a healthy pattern.

Turkey also provides B vitamins and minerals such as selenium and phosphorus, and it’s usually easier to keep it very low in saturated fat if you choose skinless breast meat. For people who want a versatile protein for meals and meal prep, turkey is often more flexible because it works in bowls, sandwiches, salads, and cooked dishes without the mercury tradeoff.

So, is tuna or turkey healthier?

For most people, skinless turkey breast is the safer “default” answer because it’s lean, low in mercury, and easy to keep simple. If your goal is weight management or a very predictable protein source, turkey often has the edge.

Tuna can be the healthier choice when you want more omega-3s, are choosing a lower-mercury type such as light tuna, and are watching preparation methods. If you eat fish regularly, tuna helps diversify your protein sources. If you mostly rely on tuna sandwiches or tuna bowls, just keep an eye on sodium and mercury exposure over time.

Bottom line: turkey is usually the better everyday lean protein, while tuna is often the better seafood option. Neither is automatically “healthier” in every situation.

Tips

• Choose skinless turkey breast or low-sodium tuna to keep the meal leaner.
• If buying tuna, pick light tuna more often than albacore to help limit mercury.
• Watch the extras: mayo, cheese, creamy sauces, and salty seasonings can outweigh the protein benefit.
• Use tuna a few times a week only if it fits mercury guidance for your age and situation.
• Pair either protein with vegetables, fruit, whole grains, or beans for a more balanced meal.