You have probably heard of the Blue Zones — a handful of places around the world where an unusual share of people seem to reach very old age. It is a genuinely interesting idea, and it comes up a lot in conversations about seafood. It is also more contested than the popular version suggests, so here is the honest account.
What the Blue Zones are
Five regions are usually named: Ikaria in Greece, the Ogliastra region of Sardinia, Okinawa in Japan, Costa Rica's Nicoya Peninsula, and Loma Linda in California. The term came out of a 2004 demographic study of Sardinia by Michel Poulain and Gianni Pes; the author Dan Buettner then worked with National Geographic to look for comparable places elsewhere.
(For the vocabulary: a centenarian is someone who reaches 100. A supercentenarian is someone who reaches 110.)
Buettner's team distilled what these communities appeared to share into nine habits they call the Power 9 — moving naturally through the day, having a sense of purpose, managing stress, stopping eating at about 80% full, eating mostly plants, moderate wine, belonging to a community, putting family first, and keeping company with people who live the same way. Diet is one of nine. It is worth holding on to that proportion.
Where fish actually fits
This is the part most often overstated, including by seafood companies, so we want to get it right.
Blue Zones diets are overwhelmingly plant-based — by the project's own description, in the region of 95% plant foods. Fish appears in most of them, but as a modest and regular food rather than a daily centrepiece. The Blue Zones food guidelines themselves suggest a serving of under three ounces, up to three times a week, favouring small, abundant species like sardines and anchovies.
Where fish intake has actually been measured, the numbers line up with that. On Ikaria, about 84% of older residents reported eating more than 150 grams of fish a week — roughly two small servings (Chrysohoou et al., Journal of Renal Nutrition, 2013). That is very close to the American Heart Association's recommendation of two servings a week at about three ounces each.
So the honest version is not "the world's longest-lived people eat a lot of fish." It is closer to: several of the longest-lived populations eat mostly plants, and fish is the animal protein that shows up most consistently alongside them, at about two or three modest servings a week.
The Adventist Health Study, in detail
The Blue Zone with the most rigorous data behind its diet is Loma Linda, because the Seventh-day Adventist community there has been studied for decades.
The Adventist Health Study-2 enrolled about 96,000 Adventists across the United States and Canada between 2002 and 2007 and has tracked their health since. When researchers compared eating patterns, every vegetarian pattern was associated with a lower risk of dying during the study than the non-vegetarian pattern — and the group with the lowest risk was the pesco-vegetarian group: people eating a plant-based diet that included fish, with an all-cause mortality hazard ratio of 0.81 against non-vegetarians (Orlich et al., JAMA Internal Medicine, 2013). A 2024 follow-up analysis found the same ordering.
Two things are worth being precise about, because they are commonly mangled. First, "pesco-vegetarian" in this study is a broad category, not a prescription: it means eating fish at least once a month while eating other meats less than once a month. It does not mean eating fish daily. Second, the differences between the vegetarian groups were small and their ranges overlapped, so the study cannot really establish that fish eaters outlive vegans. What it supports is narrower and still worth knowing: plant-forward eating patterns were associated with living longer than the meat-eating pattern, and adding fish to a plant-forward diet certainly did not cost anything.
How much weight the Blue Zones idea can carry
We would rather tell you this than have you find it elsewhere. The Blue Zones concept has drawn serious methodological criticism, principally from the demographer Saul Newman, who has argued that extreme-age records in some regions track clerical error and pension fraud more than real longevity. Blue Zones researchers have published a detailed defence of their age-verification methods in The Gerontologist, while conceding real limits — Okinawa no longer qualifies, and Nicoya's advantage is fading.
Our read: the Blue Zones are a useful observation about how people live and eat, and a poor source of hard statistics. We are happy to cite the pattern. We are not going to quote you a centenarian count as established fact, and we are not going to tell you that any single food makes you live longer.
What the evidence on fish and longevity actually supports
Across large studies, people who eat fish regularly tend to have a modestly lower risk of dying early, and a clearer reduction in cardiovascular deaths. One umbrella review of 38 cohorts found each 100 g/day increment in fish intake associated with 8% lower all-cause mortality (Jayedi & Shab-Bidar, Advances in Nutrition, 2020). These are observational patterns, not proof of cause and effect — and notably, trials of fish-oil supplements have not reproduced the benefit, which suggests it is the whole food and the overall eating pattern that matter rather than one nutrient in a capsule. More is not better, either: in Western populations the benefit appears to level off at modest intakes.
Making it easy to eat this way
If there is a practical lesson in all of this, it is that the Blue Zones pattern is unremarkable and repeatable: mostly plants, fish a couple of times a week, cooked simply, eaten with other people. The hard part is not knowing it. The hard part is having good fish in the house on a Tuesday.
That is the part we can help with. Our seafood is individually vacuum-sealed so you can thaw exactly what you need instead of committing to a whole fillet. We take the pin bones out. And we flash-freeze at the dock, so what is in your freezer in March was handled at peak quality, not left to age in a display case.
A few places to start: Blue Zone–inspired spot prawn and avocado stuffed sweet potato boats, a Mediterranean salmon bowl, or one-pan Mediterranean cod. You can read more about the Blue Zones from the project itself, and browse our wild seafood here.