Breaking News on Supplements, Health & Nutrition - Europe US edition | APAC edition

Trends > Omega-3

Meta-analysis supports fish, questions supplements, for stroke risk

By Stephen Daniells , 01-Nov-2012
Last updated on 01-Nov-2012 at 14:43 GMT2012-11-01T14:43:26Z

Regular consumption of fish may reduce the risk of coronary heart disease and stroke, but the benefits of fish oil supplements may be minimal, says a new analysis by researchers from high profile universities.

Analysis of data from 800,000 individuals in 15 countries indicated that five or more servings of fish per week were associated with a 12% reduction in the risk of cerebrovascular disease, compared with servings of one serving or less per week.

Results published in the British Medical Journal also indicated that the highest average intakes of omega-3 fatty acids, or from omega-3 supplement studies, only had a very small effect on disease risk.

Supplement findings change nothing

Challenging the conclusions about supplements, Harry Rice, PhD, VP of scientific and regulatory affairs for GOED, the omega-3 trade association, told NutraIngredients-USA that, with respect to supplementation, only 2 of 12 studies were conducted in healthy people. “The meta-analysis is really about individuals with cardiovascular disease,” he said.

“Curiously, the authors omitted a 2008 publication reporting on a sub-analysis of JELIS with respect to stroke incidence,” he said. “The results demonstrated a 20% relative reduction in recurrent stroke in the supplemented group. 

“The present results do not change the totality of the publicly available scientific evidence demonstrating cardiovascular benefits of EPA and DHA in healthy populations, as well as in the majority of populations with pre-existing cardiovascular ailments.

“Therefore, consumers should continue to eat fish, as well as take their omega-3 products for heart health.”

Study details

Led by Dr Rajiv Chowdhury at Cambridge University and Prof Oscar Franco at Erasmus MC Rotterdam, the researchers analyzed data from 38 studies with patients with established cardiovascular disease and lower risk people without the disease.

Results showed that two to four servings a week of fish were associated with a moderate 6% lower risk of cerebrovascular disease, compared with one or fewer servings of fish a week. Five or more servings a week had a 12% lower risk, they added.

On the other hand, levels of omega 3 fats in the blood and fish oil supplements were not significantly associated with a reduced risk, said the researchers.

“Our findings […] reinforce a potentially modest beneficial role of fish intake in the cause of cerebrovascular disease,” they wrote. “Such an advantage was less evident for long chain omega-3 fatty acids in both observational studies and interventions targeting primary and secondary stroke prevention.

“Our findings […] also underscore scientific gaps in the experimental evidence, specifically the lack of studies involving healthy populations and interventions targeting fish intake rather than using supplements, which may have different mechanistic effects.

“Additionally, adequately powered data from trials will be essential to investigate reliably the apparent higher risk of cerebrovascular disease observed in the secondary prevention trials of long chain omega 3 fatty acid supplements, and potential sex specific associations across observational studies.”


The heart health benefits of fish oil, and the omega-3 fatty acids it contains, are well-documented, being first reported in the early 1970s by Dr Jorn Dyerberg  and his co-workers in The Lancet and The American Journal of Clinical Nutrition.

To date, the polyunsaturated fatty acids (PUFAs) have been linked to improvements in blood lipid levels, a reduced tendency of thrombosis, blood pressure and heart rate improvements, and improved vascular function.

Source: British Medical Journal
2012: 345:e6698, doi: 10.1136/bmj.e6698
Association between fish consumption, long chain omega 3 fatty acids, and risk of cerebrovascular disease: systematic review and meta-analysis”
Authors: R. Chowdhury, S. Stevens, D. Gorman, A. Pan, S. Warnakula, S. Chowdhury, H. Ward, L. Johnson, F. Crowe, F.B. Hu, O.H. Franco

Related products

Live Supplier Webinars

Polyphenols tipped to become the way to innovate in Sports Nutrition
Alpha & Omega in Sports Nutrition – Using Omega 3’s and A-GPC to improve performance and recovery.
KD Pharma
Orally bioavailable standardized botanical derivatives in sport nutrition: special focus on recovery in post-intense physical activities
Collagen in motion: move freely and keep your injuries in check
Leading manufacturer of gelatine and collagen peptides
Life’s too short for slow proteins. Whey proteins hydrolysates: Fast delivery for enhanced performance
Arla Foods Ingredients
What it Takes to Compete and Win in Today’s Sports Nutrition Market
Sports Nutrition Snapshot: Key regional drivers and delivery format innovations
William Reed Business Media
Gutsy performance: How can microbiome modulation help athletes and weekend warriors
William Reed Business Media
Pushing the boundaries: Where’s the line between ‘cutting edge nutrition’ and doping
William Reed Business Media

On demand Supplier Webinars

High-amylose maize starch may reduce the risk of type 2 diabetes: what does this qualified health claim mean?
Balancing Innovation and Risk in Sports Nutrition Ingredients
Explaining bio-hacking: is there a marketing opportunity for food companies?
William Reed Business Media
Personalized Nutrition – how an industry can take part in shaping the future of Nutrition
BASF Nutrition & Health
Find out Nutritional and ingredient lifecycle solutions and strategies!
Is the time rIpe for I-nutrition?
William Reed Business Media
The Advantage of Outsourcing Fermentation-based Manufacturing Processes
Evonik Health Care
All supplier webinars