Tuna vs. chicken: the simple answer

For a standard cooked serving, chicken breast usually has a little more protein than tuna by weight. But the gap is small, so both are excellent high-protein choices. For example, cooked skinless chicken breast is commonly around 31 grams of protein per 100 grams, while tuna is often around 25 to 29 grams per 100 grams depending on the type and preparation.

If you compare typical portions, a 3-ounce serving of either food usually lands in the same ballpark: roughly 20 to 26 grams of protein. That means neither is a bad choice if your goal is simply to increase protein intake.

Why the numbers change so much

Protein content varies based on water content, cooking method, and cut. Cooking removes water, so protein per ounce goes up. Canned tuna, for example, can look very protein-dense because much of the water has been removed during processing.

Chicken also varies by cut. Chicken breast is one of the leanest, highest-protein options. Chicken thigh contains less protein per calorie and more fat than breast. Likewise, tuna steak, canned light tuna, and albacore tuna do not all have identical nutrition profiles.

Which is better for your goals?

If your goal is maximum protein with relatively low calories, both tuna and chicken breast are strong options. Tuna is often especially efficient if you want a very lean protein source, while chicken breast is easy to portion, widely available, and usually very consistent.

If you’re trying to build muscle, losing fat, or simply hit a daily protein target, total daily intake matters more than choosing the “winner” between these two foods. The best choice is the one you can eat regularly, prepare in a healthy way, and pair with vegetables, whole grains, or fruit for a balanced meal.

If you track meals or want to estimate protein from photos, tools like Fitnit can help you log meals more consistently while also supporting workout tracking and form analysis during home training.

Health and safety considerations

Tuna and chicken both fit well in a healthy diet, but tuna deserves a little extra attention because some types contain more mercury. The FDA and EPA advise limiting certain higher-mercury fish, especially for pregnant people, children, and those who eat seafood often.

Chicken is generally lower in mercury, but how you cook it matters. Fried or breaded chicken can add a lot of calories, fat, and sodium. For the healthiest comparison, choose grilled, baked, poached, or air-fried options with minimal added oil.

Tips

• Compare foods by cooked weight and the same serving size whenever possible.
• Choose chicken breast or tuna in water if your goal is the highest protein with fewer calories.
• Watch sodium in canned tuna and added sauces on chicken.
• Use tuna more selectively if you eat seafood often and choose lower-mercury options when possible.
• Prioritize cooking methods like grilling, baking, or poaching instead of frying.