Omega-3s are good for your heart and blood vessels in several ways.

• They reduce triglycerides, a type of fat in your blood.
• They reduce the risk of developing an irregular heart beat (arrhythmias).
• They slow the buildup of plaque, a substance comprising fat, cholesterol, and calcium, which hardens and blocks your arteries.
• They help to slightly lower your blood pressure.

These healthy fats may also help with cancer, depression, inflammation, and ADHD. Health experts are still discovering all the possible benefits of omega-3 fatty acids.

The American Heart Association (AHA) recommends eating at least 2 servings a week of fish rich in omega-3s. A serving is 3.5 ounces (100 grams), which is slightly bigger than a checkbook. Oily fish rich in omega-3s include:

• Salmon
• Mackerel
• Albacore tuna
• Trout
• Sardines

Some fish can be tainted with mercury and other chemicals. Eating tainted fish can pose health risks for young children and pregnant women.

If you are concerned about mercury, you can reduce your risk of exposure by eating a variety of fish.

Pregnant women and children should avoid fish with high levels of mercury. These include:

• Swordfish
• Shark
• King mackerel
• Tilefish

If you are middle-aged or older, the benefits of eating fish outweigh any risks.

Oily fish, such as salmon and tuna, contain two kinds of omega-3s. These are EPA and DHA. Both have direct benefits for your heart.

You can get another kind of omega-3, ALA, in some oils, nuts, and plants. ALA benefits your heart, but not as directly as EPA and DHA. Still, eating nuts, seeds, and healthy oils as well as fish can help you get a full range of these healthy fats.

Plant-based sources of omega-3s include:

• Ground flaxseeds and flaxseed oil
• Walnuts
• Chia seeds
• Canola oil and soy oil
• Soybeans and tofu

Of all plant-based foods, ground flaxseeds and flaxseed oil have the highest amount of ALA. You can sprinkle ground flaxseed over granola or in smoothies. Flaxseed oil goes well in salad dressing.

Most health experts agree that the best way to reap the benefits of omega-3 is from food. Whole foods contain many nutrients besides omega-3s. These all work together to keep your heart healthy.

If you already have heart disease or high triglycerides, you may benefit from consuming higher amounts of omega-3 fatty acids. It may be hard to get enough omega-3s through food. Ask your health care provider if taking fish oil supplements might be a good idea.

Cholesterol - omega-3s; Atherosclerosis - omega-3s; Hardening of the arteries - omega-3s; Coronary artery disease - omega-3s; Heart disease - omega-3s

Arnett DK, Blumenthal RS, Albert MA, et al. 2019 ACC/AHA guideline on the primary prevention of cardiovascular disease: Executive summary: A report of the American College of Cardiology/American Heart Association task force on clinical practice guidelines. Circulation. 2019;140(11):e563-e595. PMID: 30879339 pubmed.ncbi.nlm.nih.gov/30879339/.

Hensrud DD. Diet and nutrition. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 13.

Mozaffarian D. Nutrition and cardiovascular and metabolic diseases. In: Libby P, Bonow RO, Mann DL, Tomaselli GF, Bhatt DL, Solomon SD, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 12th ed. Philadelphia, PA: Elsevier; 2022:chap 29.

US Department of Agriculture and US Department of Health and Human Services. Dietary Guidelines for Americans, 2020-2025. 9th ed. www.dietaryguidelines.gov/sites/default/files/2020-12/Dietary_Guidelines_for_Americans_2020-2025.pdf. Accessed June 11, 2024.

Updated by: Stefania Manetti, RDN, CDCES, RYT200, My Vita Sana LLC - Nourish and heal through food, San Jose, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.