Fish is generally better for the environment than beef, pork, and chicken, producing fewer greenhouse gases, using less water, and requiring less land. According to Gram Research analysis of multiple studies, replacing meat with fish can reduce your diet’s environmental impact, though the benefit varies by fish species and location. However, fish works best for sustainability when combined with eating more plants and less meat overall, rather than simply eating more fish without other dietary changes.
A new review of scientific studies shows that fish is actually better for the environment than beef, pork, and chicken. Fish produces fewer greenhouse gases, uses less land, and requires less water than other animal products. According to Gram Research analysis, eating more fish instead of meat can help reduce your diet’s environmental impact. However, the benefits depend on which type of fish you eat and how much you consume. The research suggests fish can be part of a healthy diet that’s also good for the planet, but it works best when combined with other sustainable eating choices like eating more plants.
Key Statistics
A 2026 review of multiple scientific studies found that fish generally contributes a smaller proportion of greenhouse-gas emissions, land use, and water use compared to beef, pork, and chicken.
Research reviewed by Gram shows that computer models predicting dietary substitution of meat with fish indicate reduced environmental impacts, though the magnitude varies significantly by country, diet type, and specific fish species consumed.
A 2026 analysis found that some studies reported increased greenhouse-gas emissions associated with higher fish intake, particularly in models designed to ensure nutritional adequacy, highlighting the complexity of sustainable diet optimization.
The Quick Take
- What they studied: Whether eating fish is actually better for the environment than eating other animal products like beef and chicken, and how fish fits into diets that are both healthy and sustainable.
- Who participated: This was a review study that analyzed many other scientific studies about fish production and environmental impact. No individual participants were involved—researchers looked at existing research instead.
- Key finding: Fish generally has a smaller environmental footprint than meat and other animal products. Studies show that replacing meat with fish can reduce the environmental damage from your diet, though the exact benefit varies depending on the type of fish and where you live.
- What it means for you: Choosing fish over beef or pork is likely better for the planet. However, not all fish are equal—some types are more sustainable than others. The best approach combines eating more fish with eating more plants and less meat overall.
The Research Details
Researchers reviewed and summarized all the scientific studies they could find about how much environmental damage fish production causes. They looked at studies that measured greenhouse gases, water use, and land use for different types of fish and compared these to beef, pork, and chicken. They also examined computer models that showed what would happen if people ate more fish instead of meat. This type of study, called a literature review, helps scientists understand what we know overall about a topic by looking at many different research projects together.
By reviewing all available research instead of just looking at one study, scientists can see the bigger picture. This helps us understand whether fish is truly a sustainable choice and how it compares to other foods. The review also looked at whether eating more fish could help people get proper nutrition while reducing environmental harm—a key question for creating diets that are good for both people and the planet.
This review was published in a peer-reviewed scientific journal, meaning other experts checked the work before publication. The researchers looked at multiple studies and computer models, which makes the conclusions more reliable than any single study. However, the review notes that results vary significantly depending on fish species, location, and how the studies were done. Some studies showed benefits to the environment from eating more fish, while others found increased environmental damage, especially when ensuring people got proper nutrition.
What the Results Show
Fish generally creates less environmental damage than beef, pork, and chicken. It produces fewer greenhouse gases, uses less land, and requires less water than these other animal products. When researchers used computer models to test what would happen if people ate more fish instead of meat, they found that environmental impacts could decrease. However, the amount of improvement depends on several factors: which country you live in, what type of fish you eat, and what your overall diet looks like. For example, some fish species are more sustainable than others, and eating wild-caught fish has different environmental effects than eating farmed fish.
The research found that the relationship between fish consumption and environmental impact is complicated. Some studies showed that eating more fish actually increased greenhouse gas emissions, particularly when researchers made sure the diet provided all necessary nutrients. This suggests that simply eating more fish without changing other parts of your diet might not always help the environment. The research also showed that fish works best as part of a broader shift toward more sustainable eating—meaning eating more plants, less meat overall, and choosing fish thoughtfully rather than just replacing one animal product with another.
This review confirms what many previous studies have suggested: fish is generally more environmentally friendly than beef and pork. However, it adds important nuance by showing that the benefits aren’t automatic or equal across all situations. Previous research often focused on single countries or specific fish types, while this review shows that location and fish species matter significantly. The finding that some studies show increased emissions with higher fish intake is newer and suggests that simply eating more fish without other dietary changes may not solve environmental problems.
The review couldn’t provide exact numbers for all fish types because different studies measured environmental impact in different ways. The research also notes that computer models predicting what would happen if people ate more fish don’t always match real-world results. Additionally, the review found that ensuring people get proper nutrition sometimes conflicts with reducing environmental impact—meaning the ‘best’ diet for the planet might not always provide all necessary nutrients, and vice versa. Finally, the review couldn’t assess all possible fish species or fishing methods, so some sustainable or unsustainable options may not be fully represented.
The Bottom Line
Fish can be part of a healthy, environmentally sustainable diet. Choose fish over beef and pork when possible (moderate to strong evidence). Vary the types of fish you eat, as some species are more sustainable than others. Combine fish consumption with eating more plants and less meat overall for maximum environmental benefit (moderate evidence). Don’t rely on fish alone to reduce your diet’s environmental impact—it works best as part of broader dietary changes.
Everyone interested in eating healthier and more sustainably should consider this research. It’s particularly relevant for people trying to reduce their environmental impact through diet choices, people who eat meat regularly and want to make better choices, and families planning meals. This research is less relevant for people already eating mostly plant-based diets, as they’ve already made the biggest environmental impact reduction possible through diet.
If you switch from beef to fish, you’ll reduce your diet’s environmental impact relatively quickly—the environmental benefit happens immediately with each meal choice. However, seeing broader environmental benefits requires many people making these changes over months and years. Personal health benefits from eating more fish (like better heart health) typically appear over weeks to months of consistent consumption.
Frequently Asked Questions
Is eating fish better for the environment than eating chicken or beef?
Yes, fish generally has a smaller environmental footprint than beef and pork, producing fewer greenhouse gases and using less water and land. However, the benefit depends on which fish species you choose and how much you eat overall.
What type of fish is most sustainable to eat?
The research doesn’t specify which fish are most sustainable, as this varies by region and fishing method. Look for certifications like MSC (Marine Stewardship Council) or check local sustainability guides for recommendations specific to your area.
Will eating more fish help me lose weight and protect the environment?
Fish can be part of a healthy diet, but eating more fish alone won’t maximize environmental benefits. Combining fish with more plant-based foods and less meat overall creates the biggest positive impact for both your health and the planet.
How much fish should I eat per week for environmental reasons?
The research doesn’t specify an exact amount, but replacing one to three weekly meat meals with fish is a practical starting point. The key is combining this with eating more plants rather than simply adding fish to your current diet.
Is farmed fish or wild-caught fish better for the environment?
The research indicates both have different environmental impacts, but doesn’t clearly state which is better overall. Farmed and wild-caught fish have different greenhouse gas profiles, water use, and land use patterns depending on the species and location.
Want to Apply This Research?
- Track weekly fish servings and the type of fish consumed (salmon, cod, tilapia, etc.). Set a goal like ‘2-3 fish meals per week’ and log each meal with the species. Compare this to previous weeks to monitor consistency and identify which sustainable fish varieties you prefer.
- Replace one weekly beef or pork meal with fish. Start by identifying your favorite fish and one meal you typically eat meat for (like Wednesday dinner). Plan to swap that meal to fish for the next four weeks, then evaluate how you feel and whether you’d like to continue or adjust the frequency.
- Monthly review: Track the ratio of fish meals to total meat meals. Create a ‘sustainable fish favorites’ list in the app of species you enjoy and their environmental ratings. Set quarterly goals to try one new sustainable fish species. Monitor overall diet diversity by ensuring you’re also increasing plant-based meals alongside fish consumption.
This review summarizes scientific research on the environmental impact of fish consumption and does not constitute medical or dietary advice. Individual nutritional needs vary based on age, health status, and medical conditions. Consult with a healthcare provider or registered dietitian before making significant dietary changes, especially if you have allergies, medical conditions, or take medications that interact with foods. Environmental sustainability varies by region, fish species, and production method—check local guidelines for the most current recommendations in your area. This research reflects studies available as of 2026 and may be updated as new evidence emerges.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.