Choosing Sustainable Fish for Nutrition and Environmental Benefits

Exploring the Role of Fish in Sustainable and Healthy Diets

A recent review highlights the potential of fish to align nutritional and sustainability objectives, emphasizing the need for consumers to opt for species with lower environmental impacts and use seafood as a substitute for more resource-intensive meats.

Review: Environmental burden of fish in healthy and sustainable diets. Image Credit: Sergey Zaykov / Shutterstock

A recent narrative review in the International Journal of Food Sciences and Nutrition has delved into the role of fish in creating diets that are both nutritionally sound and environmentally sustainable. The review evaluates fish’s environmental footprint compared to other animal-based foods.

Background

Food systems are responsible for around a third of global greenhouse gas emissions and consume significant land and freshwater resources. As concerns about climate change and biodiversity loss grow, the focus has shifted toward producing foods beneficial for humans and the environment.

Fish is known for its benefits to cardiovascular health, cognitive outcomes, and overall mortality. However, the environmental sustainability of increased fish consumption remains uncertain. More research is needed to quantify the relationships between fish’s nutritional benefits and ecological impacts.

This infographic titled ‘Environmental Burden of Fish in Healthy and Sustainable Diets’ includes three main panels: Observational Studies assess the environmental impact of fish intake, noting generally low impacts; Environmental Footprint Analyses explain that most fish have lower emissions than terrestrial meats, while variability exists by species; Dietary Optimization Models focus on how fish intake can vary based on dietary goals and constraints. The bottom section summarizes overall conclusions and future research needs, emphasizing the balance of health, environmental, and sustainability factors in fish consumption.

Fish and Sustainability: An Intricate Balance

In the realm of sustainable diets, fish holds a unique position. It often provides significant nutritional benefits with a smaller environmental footprint compared to many animal-based foods. However, the environmental impact varies based on fish type, fishing methods, aquaculture practices, and supply chains.

Current Dietary Environmental Impact of Fish

Research from various countries shows that fish generally contributes less to dietary environmental impacts than meat. In countries like the UK, Netherlands, France, and others, fish accounts for a smaller share of dietary greenhouse gas emissions compared to meat, though this varies by country and seafood type.

UK studies involving over 65,000 adults revealed that fish-eaters had lower greenhouse gas emissions than meat-eaters, supporting the idea that healthier, more sustainable diets often include more fish.

While small pelagic fish and mollusks typically have lower environmental burdens, crustaceans and some aquaculture systems can be more carbon-intensive.

Optimizing Diets with Fish

Dietary modeling techniques have been used to create eating patterns that meet nutritional needs while minimizing environmental impact. Research suggests that diets optimized for nutrition often include more fish.

In many European countries, substituting meat with fish has decreased greenhouse gas emissions and land use. Fish often replaces environmentally intensive meats, maintaining nutritional quality while achieving environmental goals.

Some models encourage the consumption of oily fish due to its nutrient density and health benefits.

Challenges in Increasing Fish Consumption

Merely increasing fish consumption does not guarantee environmental benefits. Some dietary models aiming for significant greenhouse gas reductions require lower fish intake or shifts to lower-impact seafood species.

Meeting aggressive emission reduction targets sometimes leads to reduced fish consumption due to the high carbon emissions of certain seafood types.

Women often need to increase fish consumption more than men for nutritional requirements. Differences in baseline diets and nutrient needs contribute to this disparity.

Creating sustainable diets requires considering local food culture, nutritional needs, environmental goals, and seafood availability.

Implications for Public Health and Policy

This review has important implications for policymakers, healthcare professionals, and consumers. For consumers, replacing red and processed meats with carefully selected fish can improve diet quality and reduce environmental impacts. However, informed choices are crucial, as environmental performance varies widely among seafood products.

Food systems can enhance access to sustainably caught seafood and improve aquaculture practices to support healthy diet transitions. Investments in responsible fisheries management will strengthen fish’s role in sustainable food systems.

Disclosure

The authors disclosed support from Bolton Food S.P.A.; one author was an employee of the company, but the funder had no role in the study design, analysis, interpretation, or writing.

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