What is the healthiest seafood to eat regularly?

Fatty, low-contaminant fish are generally the healthiest seafood to eat regularly because they provide long-chain omega-3 fatty acids, high-quality protein, and essential micronutrients while posing lower risks from environmental contaminants. Small oily species such as sardines and anchovies, together with wild-caught Alaskan salmon and freshwater trout, commonly appear in dietary guidance from nutritional researchers and public health organizations as practical, health-promoting choices.

Nutritional profile and health effects

Long-chain omega-3 fatty acids eicosapentaenoic acid and docosahexaenoic acid support cardiovascular health and neurodevelopment. Dariush Mozaffarian at Tufts University Friedman School of Nutrition Science and Policy has published research linking regular fish consumption with lower cardiovascular disease risk and improved lipid profiles. The American Heart Association recommends eating fish, particularly fatty fish, at least two times per week as part of a heart-healthy diet. Walter Willett and Frank Hu at Harvard T.H. Chan School of Public Health have emphasized that choosing fish high in omega-3s while minimizing exposure to contaminants yields substantial public health benefit. For pregnant people and young children, these nutrients contribute to fetal brain growth and infant cognitive outcomes when obtained from low-contaminant seafood sources, a point reinforced by maternal nutrition reviews at established public health institutions.

Contaminants, sustainability, and cultural considerations

Mercury and other contaminants vary widely among species and environments. The US Food and Drug Administration and Environmental Protection Agency advise limiting or avoiding consumption of high-mercury species such as shark, swordfish, tilefish from the Gulf of Mexico, and king mackerel, particularly for pregnant people, women who may become pregnant, and young children. Selecting small, short-lived species and fish from less-contaminated waters reduces this risk. Sustainability also matters for long-term food security and marine ecosystems. The Monterey Bay Aquarium Seafood Watch program offers regionally specific guidance to help consumers choose seafood that supports fisheries and aquaculture practices with lower ecological impact.

Relevance, causes, and consequences

The health advantages of eating seafood regularly arise from both biological mechanisms and dietary patterns. Omega-3 fatty acids modulate inflammation and thrombosis and influence cell membrane function, explaining observed associations with reduced heart disease and better developmental outcomes. However, industrial pollution, artisanal mining, and long-range atmospheric transport cause mercury and persistent organic pollutant contamination in some marine food webs, creating trade-offs between benefits and risks. Overfishing, habitat destruction, and poorly managed aquaculture can degrade ecosystems and reduce the future availability of nutritious seafood, disproportionately affecting coastal and Indigenous communities that rely on local harvests for cultural identity and food sovereignty.

Practical guidance

Prioritize small oily fish such as sardines and anchovies, wild-caught Alaskan salmon, and trout for regular consumption. Follow local advisories and national guidance from the US Food and Drug Administration and consult sustainability tools such as the Monterey Bay Aquarium Seafood Watch when possible. For personalized recommendations, especially during pregnancy or for children, seek advice from a clinician or registered dietitian familiar with regional seafood supplies and consumption patterns.