Pescatarian: vegetarian with a fishing licence. Quietly one of the best options.
No meat, but fish and seafood are in. It sounds like a compromise. In the studies, it often looks more like a sweet spot: most of the benefits of going meat-free, without the omega-3 problem.
The short version
- What it is
- A vegetarian diet plus fish and seafood. Eggs and dairy usually stay.
- Good for
- Heart health in the long-term studies, easy omega-3 and B12, a lot of variety.
- Bad at
- Your wallet if you buy fresh fish only. And the fish counter isn't always good news for the oceans.
- Evidence
- Moderate. Good observational data, no long-term trials of the diet itself.
- Our take
- One of the easiest filters to build a great plan around. Oily fish twice a week, sorted.
What a pescatarian diet actually is
Take a vegetarian diet and add fish and seafood. That's it. No beef, pork, lamb or chicken. Yes to salmon, sardines, mackerel, cod, mussels, prawns. Most pescatarians also eat eggs and dairy.
The spelling fights are real (pescatarian or pescetarian, both fine) and so is the range. Some people eat fish daily, some once a month and mostly live on lentils. For health, the sweet spot is plants as the base and fish a couple of times a week, which is close to how people traditionally eat on the coasts of Portugal and Galicia. Our Atlantic diet article covers that style.
How it works in your body
You get the plant-heavy benefits of vegetarian eating: more fibre, less saturated fat, no processed meat. Then fish fills the gaps.
Oily fish like salmon, sardines, mackerel and herring bring long-chain omega-3 fats (EPA and DHA), which your body can only make in small amounts from plant sources. Fish and seafood also bring vitamin B12, iodine, selenium and, in oily fish, vitamin D. Shellfish like mussels add iron and zinc. Small fish eaten with their bones, such as tinned sardines, add calcium.
Translation: most of the nutrients that vegetarians have to plan for, a pescatarian gets on a plate of sardines.
What you eat, what you don't
Eat
- Oily fish: salmon, sardines, mackerel, herring, trout
- White fish: cod, hake, pollock
- Shellfish: mussels, clams, prawns, squid
- Beans, lentils, chickpeas, tofu
- Eggs, natural yoghurt, some cheese
- Vegetables, fruit, whole grains, nuts and seeds
- Tinned fish: cheap, long-lasting, just as good
Forget it
- Meat and poultry
- Fish fingers, battered fish and fried seafood as your "fish"
- Swordfish, shark and marlin more than once a week
- Soft drinks, sweets, white bread
- Surimi "crab" sticks and other processed fish products as everyday food
Alcohol on a pescatarian diet
OK, now and then
- A glass of dry white wine or Albariño with fish
- Spirits neat or with soda water and lime
- One light beer with a seafood dinner
Not worth it
- Sweet cocktails and sugary mixers
- "Just one more bottle" at the seafood restaurant
- Drinking on an empty stomach
50 Club: one glass of dry white with your weekend fish.
A fish dinner doesn't turn wine into health food. The World Health Organization says no safe level of drinking has been shown.9 All the details are in our alcohol guide.
What it's good for, with proof
Less heart disease
In the UK's EPIC-Oxford study, 48,188 people were followed for about 18 years. Fish eaters had 13% less heart disease than meat eaters, and unlike vegetarians, no increase in stroke.1 Observational, but large and long.
Lower death rates, in one big study
Among 73,308 Seventh-day Adventists in the US, pesco-vegetarians had the lowest death rates of any group, about 19% lower than non-vegetarians.2 Adventists are an unusually healthy group to begin with, so don't read this as "fish adds years". Read it as "fish fits well in a healthy life".
Fish: the benefits beat the worries
A major review in JAMA weighed fish's benefits against mercury and other pollutants. For adults, the authors concluded the benefits clearly outweigh the risks, with one to two servings a week, especially oily fish, giving most of the benefit.3 For women who may become pregnant, the same held, apart from a few high-mercury species.
The uncomfortable truth
"Fish oil capsules give you the same benefit." Apparently not. The Cochrane review of 79 trials and over 112,000 people found omega-3 supplements had little or no effect on heart attacks, strokes or deaths.4 Whatever fish does for people, the pill doesn't seem to copy it. Eat the fish.
"Fish is always the sustainable choice." Not automatically. The UN's food agency reports that over a third of assessed fish stocks are overfished.5 Small oily fish like sardines, herring and mackerel, mussels, and fish with a credible sustainability label are the better bets.
The risks
- Mercury in big predatory fish. The NHS advises adults to eat shark, swordfish and marlin no more than once a week, and children and pregnant people to avoid them completely.6
- Pregnancy. No more than two portions of oily fish a week, tuna limited to four cans or two steaks a week, and no shark, swordfish or marlin.7
- Too much oily fish. Oily fish carries small amounts of pollutants. The NHS caps it at four portions a week for most adults and two for girls and anyone who is or may become pregnant.6
- Raw seafood in pregnancy. The NHS says to avoid raw fish and raw shellfish, including sushi made with them, and to cook cold-smoked fish like smoked salmon until steaming hot, because of food poisoning and listeria.7
- Iron. Without red meat, iron can run low, especially with heavy periods. Mussels, clams, lentils and greens help.
Allergies: watch the staples
This is the big one. Fish, crustaceans and molluscs are three separate allergens, and plenty of people react to one but not another.
| Staple | Allergen (EU list of 14)8 | Swap |
|---|---|---|
| Salmon, sardines, cod, tuna, anchovies | Fish | Eggs, beans, tofu; flax and walnuts for omega-3. Honestly, then you're vegetarian |
| Prawns, crab, lobster | Crustaceans | Fish (if tolerated), eggs |
| Mussels, clams, squid, octopus | Molluscs | Fish (if tolerated), lentils |
| Fish sauce, Worcestershire sauce, Caesar dressing | Fish | Soy sauce or miso (if no soy allergy) |
| Eggs, cheese, yoghurt | Eggs, milk | Fish, tofu, beans |
| Tofu, edamame | Soy | Fish, lentils, chickpeas |
| Breaded fish, fish cakes | Cereals containing gluten, eggs | Plain grilled or baked fish |
Don't go pescatarian if you…
- are allergic to fish or shellfish: then this is a vegetarian diet with extra risk
- are pregnant and don't follow the fish limits above
- have iron-deficiency anaemia, without a plan from your doctor
- have ever had an eating disorder and are using the label to restrict
Healthen me asks about all of these and gives you a different plan if any apply.
How we use pescatarian in your plan
Pescatarian is a filter you pick in Healthen me. Meat and poultry go; fish, seafood, eggs and dairy stay. The engine makes sure oily fish shows up about twice a week and keeps the high-mercury species out.
It also fits our core rules beautifully. Your fast-breaking meal can be sardines with salad, smoked mackerel with eggs, or salmon with greens: low-carb, high-protein, done. The rest of your meals follow the Mediterranean pattern, which is mostly pescatarian already.
Tinned fish is in all our recipes for a reason: cheap, fast, and the bones bring calcium.
This article is general information, not medical advice. If you have a medical condition or take medication, talk to your doctor before changing how you eat.
Sources
- Tong TYN et al. Risks of ischaemic heart disease and stroke in meat eaters, fish eaters, and vegetarians over 18 years of follow-up: results from the prospective EPIC-Oxford study. BMJ 2019;366:l4897. doi.org/10.1136/bmj.l4897
- Orlich MJ et al. Vegetarian dietary patterns and mortality in Adventist Health Study 2. JAMA Internal Medicine 2013. doi.org/10.1001/jamainternmed.2013.6473
- Mozaffarian D, Rimm EB. Fish intake, contaminants, and human health: evaluating the risks and the benefits. JAMA 2006;296(15):1885–1899. doi.org/10.1001/jama.296.15.1885
- Abdelhamid AS et al. Omega-3 fatty acids for the primary and secondary prevention of cardiovascular disease. Cochrane Database of Systematic Reviews 2020;3:CD003177. doi.org/10.1002/14651858.CD003177.pub5
- FAO. The State of World Fisheries and Aquaculture 2024. Rome, 2024. doi.org/10.4060/cd0683en
- NHS. Fish and shellfish. nhs.uk/live-well/eat-well/food-types/fish-and-shellfish-nutrition
- NHS. Foods to avoid in pregnancy. nhs.uk/pregnancy/keeping-well/foods-to-avoid
- Regulation (EU) No 1169/2011 on food information to consumers, Annex II (the 14 allergens). eur-lex.europa.eu/eli/reg/2011/1169/oj
- WHO Regional Office for Europe. No level of alcohol consumption is safe for our health. News release, 4 January 2023. who.int/europe/news/item/04-01-2023-no-level-of-alcohol-consumption-is-safe-for-our-health