Sarah spent eleven years telling people she’d never eat anything with a face again. She had the tattoo, the cookbook collection, the well-practiced answer for nosy relatives at holiday dinners.
Then, two years ago, she found herself standing in a grocery store parking lot in Portland, staring at a piece of wild-caught salmon in her cart like it was contraband.
She’s not alone. Across forums, podcasts, and quiet admissions to friends, a small but noticeable group of longtime vegans are reintroducing fish into their diets after years—sometimes decades—of strict plant-based eating. They’re not becoming full omnivores. Many still avoid dairy, eggs, and land meat entirely. But fish has become a specific, deliberate exception.
Key Takeaways
- A documented subset of longtime vegans are reintroducing fish specifically, not meat or dairy, often after years of strict plant-based eating.
- Common triggers include lab work showing deficiencies in B12, iron, omega-3s, or protein that supplementation didn’t fully resolve.
- Some cite evolving views on fish sentience and smaller-scale fisheries as easier to reconcile ethically than industrial livestock farming.
- Practical pressures—pregnancy, aging, chronic fatigue, travel, and social eating—push many toward pescatarianism as a sustainable middle ground.
- Most people making this switch describe it as a personal recalibration, not a rejection of vegan values overall.
The Health Numbers That Started the Conversation
For many people who eventually add fish back, the shift doesn’t start with a craving. It starts with a lab report.
Vegan diets, when well-planned, can meet nutritional needs across most life stages, according to the Academy of Nutrition and Dietetics.
The operative phrase is ‘well-planned.’ In practice, long-term adherence without careful supplementation or planning can leave people short on B12, iron, zinc, and long-chain omega-3 fatty acids like EPA and DHA, which are far more bioavailable from fish than from plant-based ALA sources like flaxseed or walnuts.
Several people interviewed for this piece described years of fatigue, brain fog, or thinning hair that supplements didn’t fully resolve. Blood panels showing low ferritin or borderline B12, even while taking supplements, prompted some to reconsider.
This wasn’t universal—plenty of long-term vegans maintain excellent bloodwork—but for a specific subset, especially those with absorption issues or higher activity levels, the numbers became hard to ignore.
One nutrition-adjacent detail that came up repeatedly: people who’d been vegan for over five years reported it became harder, not easier, to hit the same nutritional targets they’d nailed early on, often due to changing life circumstances like new jobs, kids, or less time to meal-prep.
For readers curious about maximizing plant protein without adding fish, this list of high-protein foods for vegans covers many of the denser options people try first.
The Environmental Argument Gets More Complicated
Environmental concern is one of the most common reasons people go vegan in the first place, and it’s also one of the more nuanced reasons some walk it back—partially.
The picture isn’t simple. Industrial animal agriculture, particularly beef and dairy, carries a well-documented environmental footprint in terms of land use, water, and greenhouse gas emissions, per research summarized by the Our World in Data food emissions project.
Fish, especially smaller species harvested through low-impact methods, generally carries a smaller footprint than red meat, though this varies enormously by species, farming method, and region. Farmed salmon and wild-caught sardines are not the same story environmentally, and neither is a single tuna steak versus a can of anchovies.
Some pescatarian returners describe digging into this research and landing on a middle position: cutting out land animals dramatically reduces their footprint most of the time, and adding back small, sustainably sourced fish species doesn’t meaningfully undo that.
It’s a compromise position, not a loophole, and the people making it tend to be fairly specific about sourcing—favoring certified sustainable fisheries and smaller fish lower on the food chain.
Rethinking the Ethics of Fish Specifically
Ethics is the trickiest thread here, and the people navigating it are often doing so in real time, without a tidy conclusion.
Vegan ethics generally rest on avoiding harm to sentient beings capable of suffering. Fish sentience has become a genuinely debated area of animal cognition research, and reasonable people land in different places on it.
Some longtime vegans who add fish back describe having thought hard about this and concluding that, for them, fish occupy a different ethical category than mammals and birds—not necessarily incapable of suffering, but different enough in their reasoning to change the calculus personally.
Others are more candid: it’s a rationalization that lets them meet a practical need, and they know it.
This mirrors a similar internal debate some vegans have long had over honey, where the line between strict and flexible veganism gets drawn in genuinely different places depending on personal ethics—a tension explored in Why Some Vegans Still Eat Honey & Others Refuse It Completely.
There’s no single vegan consensus on fish, just as there isn’t one on honey, and that ambiguity is part of what makes room for individual reconsideration.
The Practical, Unglamorous Reasons
Beyond health panels and ethical debates, a lot of this comes down to daily life simply being hard to sustain on a fully restrictive diet indefinitely.
Pregnancy and postpartum recovery
Several women described adding fish during pregnancy or while breastfeeding, citing concerns about DHA for fetal brain development and their own postpartum recovery, often on the advice of a doctor or midwife who flagged low iron or omega-3 levels.
Aging and changing nutrient needs
Nutrient absorption, particularly of B12 and protein, tends to become less efficient with age. Some longtime vegans in their 40s, 50s, and beyond found that a diet that worked well for them at 25 required more effort to sustain comfortably decades later.
Chronic fatigue that didn’t resolve
Not everyone’s fatigue is nutrition-related, but for those whose bloodwork pointed to gaps that diet alone (with supplements) wasn’t closing, fish became a targeted, minimal addition rather than a full dietary overhaul.
Social and travel friction
Years of being ‘the vegan friend’ at every dinner, wedding, and work trip wears on people. Pescatarian eating opens up far more restaurant menus and travel destinations without requiring a full return to eating meat, making social life meaningfully easier.
Cooking fatigue and variety
Some people described plain burnout on the repetition of vegan meal prep, even while still loving dishes like vegan lentil soup or vegan mushroom pasta. Adding fish opened a new category of quick, protein-dense meals without abandoning the plant-forward cooking they’d built their skills around.
What This Shift Isn’t
It’s worth being clear about what the data and interviews don’t support: this isn’t evidence that veganism is unsustainable or wrong for everyone. Long-term vegans who plan their diets carefully, get regular bloodwork, and supplement appropriately continue to thrive on fully plant-based eating, and most vegans never reintroduce animal products of any kind.
It’s also not a rejection of the broader values that drew people to veganism—reducing suffering, environmental concern, health. Most pescatarian returners still avoid land meat and dairy entirely and describe fish as a narrow, considered exception rather than a return to their old way of eating.
If anything, it reflects how personal and situational dietary ethics really are, something also visible in ongoing debates over ultra-processed vegan foods that technically meet the label but arguably miss the point of eating plant-based for health.
Frequently Asked Questions
Is this trend backed by actual data, or just anecdotes?
Formal, large-scale surveys specifically tracking ‘vegans returning to fish’ are limited, but nutrition researchers and dietitians have documented rising rates of former vegans citing nutrient deficiencies, and pescatarian identity has grown as a distinct, tracked category in diet surveys. Much of the current picture comes from interviews, forums, and clinical anecdotes rather than a single definitive study.
Do you have to give up being ‘vegan’ if you eat fish occasionally?
By most standard definitions, adding fish means the diet is technically pescatarian rather than vegan, since veganism excludes all animal products. Many people making this switch acknowledge that shift in labeling openly rather than calling themselves vegan while eating fish.
What nutrients does fish provide that are hardest to get from plants?
The main ones are long-chain omega-3 fatty acids (EPA and DHA), highly bioavailable B12, and easily absorbed heme-adjacent iron and zinc. Plant sources exist for related nutrients, but conversion rates and absorption are generally less efficient, which is why some people turn to fish specifically rather than more plant food.
Is farmed or wild fish the better choice for people making this switch?
It depends on the species and priority. Wild-caught smaller fish like sardines and mackerel tend to have a lower environmental footprint and fewer contaminant concerns than large predatory fish, while some farmed fish operations have improved sustainability practices significantly. People concerned about ethics and environment typically research specific sourcing rather than treating all fish as equivalent.
Can a vegan diet meet all nutritional needs without fish?
Yes, according to major nutrition bodies including the Academy of Nutrition and Dietetics, a well-planned vegan diet can be nutritionally adequate at every life stage. The key word is well-planned—many people who struggle do so because of inconsistent supplementation or higher nutrient demands, not because plant-based eating is inherently insufficient.
Utter crap. They’re looking to justify hurting animals for their own selfish reasons.