What happens to your blood pressure when you eat tuna regularly

Medically reviewed by Jamie Johnson, RDN

Key Takeaways

• Tuna provides omega-3 fatty acids, which may help support healthy blood pressure by aiding blood vessel function.
• Tuna packed with added salt or brine can be loaded with extra sodium, which may counteract potential benefits.
• Tuna can be part of a blood pressure-friendly eating pattern, but no single food lowers blood pressure on its own.

Tuna is a great source of protein and omega-3 fatty acids, nutrients linked to healthy blood pressure. However, the type of tuna you choose, how it’s packaged, and your preparation methods strongly influence its diet-related effects.

Can Eating Tuna Help Lower Blood Pressure?

Possibly, but don’t expect dramatic shifts from tuna alone.

Tuna contains the marine omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which research suggests may modestly lower blood pressure, particularly in people who already have hypertension (high blood pressure).

These healthy fats appear to support blood vessel function, facilitating smoother blood flow throughout the body.

Rather than a “magic bullet,” tuna is best viewed as one component of an overall eating pattern that supports healthy blood pressure. Its greatest diet-related potential lies in replacing foods higher in saturated fat or loaded with sodium.

Why Omega-3 Fats Matter

EPA and DHA are long-chain omega-3 fatty acids found in tuna and other seafood. Research suggests that these fats support healthy blood vessel function by increasing the bioavailability of nitric oxide, a compound that helps blood vessels relax and dilate:

• Improved flexibility: Omega-3s may improve the elasticity of artery walls, which supports healthy blood pressure over time.
• Reduced inflammation: By lowering systemic inflammation, these fats contribute to the overall health of the cardiovascular system.
• Variable impact: While benefits are most pronounced in those with existing hypertension, smaller positive trends have been observed in adults with normal blood pressure.

What Does the Research Say?

Clinical evidence suggests that marine omega-3 fatty acids are associated with modest blood pressure improvements, particularly among adults with hypertension:

• Clinical findings: A meta-analysis in the Journal of the American Heart Association found that consuming approximately 2 to 3 grams of EPA and DHA per day was associated with reductions in systolic blood pressure.
• Making sense of the results: Most studies measure total EPA/DHA intake rather than tuna intake alone. Furthermore, blood pressure is a complex metric influenced by physical activity, sleep quality, genetics, body weight, and prescribed medications.
• What experts say: The American Heart Association (AHA) recommends eating fish—particularly fatty fish—about twice a week as part of an overall heart-healthy eating pattern.

Watch the Sodium in Canned Tuna

Not every can of tuna is equally supportive of healthy blood pressure. Some canned varieties are packed in salt or brine, which can substantially increase their sodium content.

Because excess sodium is a primary driver of elevated blood pressure in many people, regularly choosing high-sodium canned products may offset the benefits of tuna’s omega-3 content. You can reduce the amount of sodium in your tuna by:

• Reading labels carefully: Compare Nutrition Facts labels to identify lower-sodium products; look for “no salt added” or “low sodium” designations.
• Rinsing before eating: If you have cans packed in salt, draining and thoroughly rinsing the tuna can remove some, though not all, of the added sodium. A landmark study found that a 3-minute rinse resulted in an 80% sodium reduction.

How You Prepare Tuna Matters

The ingredients you pair with tuna often influence your blood pressure more than the fish itself. Traditional tuna salad recipes frequently rely on mayonnaise, pickles, or processed seasonings that drive up sodium intake.

Try these heart-healthy swaps for your next tuna dish:

• Healthy fats: Instead of mayonnaise, substitute a dollop of Greek yogurt, olive oil, or mashed avocado.
• Flavor enhancers: Use fresh lemon juice, vinegar, garlic, or dried herbs instead of extra salt or pre-packaged seasoning blends.
• Produce additions: Mix in fiber-rich vegetables like diced celery, cucumbers, tomatoes, or bell peppers for crunch and extra potassium.
• Legumes: Add beans or chickpeas to the mix for a boost of fiber, which is associated with healthy blood pressure management, especially in people with hypertension and type 2 diabetes.

Is There Anyone Who Should Limit Tuna?

While tuna is a nutrient-dense food, it’s not an ideal choice for unlimited daily consumption for everyone. You may need to consider the following:

• Mercury levels: Some species of tuna contain higher levels of mercury than others. People who are pregnant or breastfeeding, young children, and those who eat fish frequently should follow current federal recommendations for choosing lower-mercury fish and limiting higher-mercury varieties.
• Salt sensitivity: If you have high blood pressure or salt sensitivity, it’s important to pay close attention to the sodium content of processed canned tuna products.

Read the original article on Verywell Health