What are the macros in tuna?

Most plain tuna is nearly all protein and fat, with essentially no carbohydrates. A standard 3-ounce cooked portion of fresh tuna or a drained can of tuna in water usually provides about 20 to 25 grams of protein, 1 to 5 grams of fat, and 0 grams of carbs. Calories are typically in the 90 to 150 range for tuna packed in water, with fresh cuts varying by species and preparation.

The biggest macro difference comes from packing liquid. Tuna in water stays very lean, while tuna packed in oil can add several grams of fat and noticeably more calories per serving. If you are counting macros closely, always check the label for the drained serving size, not just the can size.

How tuna macros change by type

Not all tuna is nutritionally identical. Canned light tuna, often made from skipjack, is usually lower in mercury and tends to be a little lower in calories than albacore. Albacore tuna generally has a firmer texture and slightly more fat, which means a few more calories per serving.

Fresh tuna steaks can also vary. Leaner cuts like yellowfin are still high in protein, while fattier species such as bluefin contain more fat and more calories. If you want the leanest option for macro tracking, choose tuna packed in water or a plain grilled tuna steak without added oil.

Is tuna a good food for high-protein diets?

Yes. Tuna is popular for muscle-building and fat-loss meal plans because it gives you a lot of protein for relatively few calories. Protein also tends to increase fullness, which can make it easier to stay within a calorie target. Tuna works well in salads, wraps, rice bowls, pasta dishes, and quick snack plates with vegetables and whole grains.

For people who lift weights or work out at home, tuna can help you hit your daily protein goal without a lot of prep time. If you use an app like Fitnit to track reps and training sessions, pairing that routine with a simple protein-rich meal like tuna can make post-workout planning easier.

What to watch for: sodium, oil, and mercury

Macros are only part of the story. Canned tuna can be high in sodium depending on the brand and flavoring, so it is smart to compare labels if you eat it often. Tuna packed in oil also changes the macro profile because the oil adds fat and calories, even after draining.

Mercury is another reason to vary your seafood choices. Larger tuna species generally contain more mercury than smaller ones, so frequent eaters should rotate in other protein sources like salmon, sardines, chicken, eggs, Greek yogurt, beans, or tofu. That way you can keep the same high-protein benefits without relying on tuna every day.

Tips

• Check the label for the drained serving size, since the can size is not the same as the macro serving.
• Choose tuna in water if you want the highest protein-to-calorie ratio.
• Use tuna in oil only when you want the extra fat and calories on purpose.
• Mix tuna with high-fiber foods like beans, vegetables, or whole grains to make meals more filling.
• Rotate tuna with other protein sources if you eat seafood often, especially larger tuna species.