Nutrition: tuna and chicken are both high-protein foods

Both tuna and chicken breast are excellent protein sources. A typical serving of either can give you a large amount of protein with relatively few calories, especially if you choose tuna packed in water and skinless chicken breast.

The biggest nutritional difference is that tuna naturally contains more omega-3 fats, while chicken is usually lower in fat and has a more neutral nutrient profile. That means tuna may offer more heart-health benefits, but chicken is often the simpler lean-protein option for high-protein diets.

Health tradeoffs: mercury, sodium, and food safety

One major reason chicken is often the safer everyday choice is mercury. Tuna can contain measurable mercury, and larger species such as albacore tend to have more than light tuna. The FDA and EPA advise limiting certain tuna choices, especially for people who are pregnant, breastfeeding, or feeding young children.

Chicken has no mercury concern, but processed chicken products can be high in sodium. Tuna can also become sodium-heavy if it is canned in brine or used in prepared meals. For both foods, the healthiest version is usually minimally processed and not heavily salted.

Which is better for your goal?

For fat loss or calorie control, both can work well, but chicken breast is often the easier default because it is very lean and widely available in large portions. For heart health, tuna can be attractive because of its omega-3 content, especially if you choose lower-mercury options and keep portions moderate.

For muscle building, either food can support your protein needs. The best choice may simply be the one you can eat consistently without getting bored. If you track workouts and protein intake at home, Fitnit can help you stay consistent by counting reps and checking form during bodyweight training.

Bottom line: is tuna better than chicken?

Tuna is not universally better than chicken. Tuna is often more nutrient-dense in terms of omega-3s and may be a strong choice for occasional meals, but chicken is usually better for everyday eating because it has no mercury concern and is easy to fit into many meal plans.

A practical approach is to use both: chicken as a frequent lean protein, and tuna a few times a week as a convenient, heart-healthy option. That gives you variety without overdoing mercury or relying too much on one food.

Tips

• Choose light tuna more often than albacore if you eat tuna regularly.
• Pick tuna in water and chicken breast without breading for the leanest option.
• Watch sodium on canned tuna, deli chicken, and packaged protein meals.
• Rotate proteins during the week instead of eating only one source.
• If you are pregnant or feeding kids, follow FDA/EPA tuna guidance carefully.