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Meta-Analysis Links Higher Fish Intake To Lower Death Risk In Japan

A pooled analysis of Japanese cohort studies found more fish eaters had lower death risk, with effects leveling off past about 100 grams a day.

By Dr. Axe Editorial Team · October 25, 2026 · 1 source · Watch

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A systematic review and meta-analysis published October 23, 2026 in the European Journal of Clinical Nutrition found that Japanese adults with higher fish intake had a 6% lower risk of death from any cause and a 15% lower risk of cardiovascular death.

6%lower all-cause death risk

15%lower heart death risk

16studies, Japan

Researchers searched the MEDLINE and Ichushi-Web databases and screened 113 articles, narrowing to 16 prospective cohort studies conducted in Japan, with nine pooled into the meta-analysis. Comparing the highest fish intake group against the lowest in each cohort, higher intake was linked to a 6% lower risk of death from any cause, a hazard ratio of 0.94 with a range of 0.89 to 0.98, and a 15% lower risk of cardiovascular death, a hazard ratio of 0.85 with a range of 0.80 to 0.91. Heterogeneity across the pooled studies was described as low. Trend and spline modeling showed mortality risk falling as fish intake rose up to about 100 grams per day, after which the decline slowed, suggesting a plateau at higher intakes. The protocol was registered in advance with PROSPERO (CRD42025635066).

The authors did not report a biological mechanism. Fatty fish supply omega-3 fats, which support healthy blood vessel function and help regulate inflammatory signals tied to cardiovascular disease; that is established background physiology, not this review's finding. This is a link found in population data, not proof that fish caused the lower death rates, and the plateau above 100 grams a day means higher intake did not keep adding measurable benefit in these cohorts.

Fish Intake and Mortality Risk: Highest vs Lowest Intake Groups

European Journal of Clinical Nutrition, 2026, Yokoi et al.

The authors rated overall certainty of evidence as low using the GRADE framework, and this was an abstract record without full study-level detail on confounders, fish type or preparation method. The studies were observational, so differences in overall diet quality or activity between high and low fish eaters could account for part of the association.

Dr. Axe’s Take

This fits what I'd expect from a population built around fish as a dietary staple. Fatty fish deliver omega-3s that support heart and vascular health, and this pooled analysis lines up with decades of similar findings. The plateau around 100 grams a day, roughly a modest fillet, tells me more isn't automatically better. My practical plan: eat a few servings of fatty fish like salmon each week, favor wild-caught, lower-mercury choices, rotate in plant omega-3 sources such as walnuts and flax seeds, and pair fish with vegetables and olive oil rather than chasing extreme intake.

— Dr. Axe

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Study summary

Who: Japanese adults across 16 prospective cohort studies; nine pooled in meta-analysis
Design: Systematic review and dose-response meta-analysis of cohort studies, highest vs lowest fish intake
Dose: Benefit leveled off above approximately 100 g/day fish intake
Primary result: All-cause mortality 6% lower in highest vs lowest fish intake group (hazard ratio 0.94, range 0.89-0.98)
Secondary: 15% lower cardiovascular mortality (HR 0.85, 95% CI 0.80-0.91); low heterogeneity; GRADE certainty rated low
Funding / conflicts: Funder listed in the journal record: Nissui Corporation, a Japanese seafood company. Conflict statement in the PubMed record: Competing interests: KY and AK are employed by Nissui Corporation.
Date: Oct 23, 2026