Food systems account for nearly one-third of global greenhouse gas emissions.
Fish in Sustainable Diets: A Delicate Balance
A narrative review published in the International Journal of Food Sciences and Nutrition has examined the complex role of fish in building healthy, environmentally sustainable diets, comparing its environmental footprint to other animal-based foods.
Key Findings
- Fish consumption is linked to cardiovascular and neurocognitive benefits, but its sustainability depends heavily on species, production method, and which foods it replaces.
- In typical diets across multiple countries, fish contributes a relatively small share of dietary greenhouse gas emissions compared to meat.
- Small pelagic fish and mollusks have lower environmental burdens; crustaceans and some aquaculture systems are more carbon-intensive.
The Environmental Trade-Offs
- Dietary modeling often shows increased fish consumption when optimizing for nutrition, especially to meet requirements for long-chain omega-3 fatty acids.
- Replacing red and processed meat with fish can reduce emissions and land use, but simply increasing fish intake does not guarantee environmental benefits.
- Under stringent emission reduction targets, fish consumption may decline or shift to lower-impact species.
No Universal Solution
No one-size-fits-all approach exists; strategies must consider local food culture, nutritional needs, environmental goals, and seafood availability.
Study Details
The review was supported by Bolton Food S.P.A. One author was an employee of the company, but the authors stated the funder had no role in study design, analysis, interpretation, or writing.