The theory that certain fatty acids are essential to the diet and associated with reduced cardiovascular risk has been controversial since it was floated in the 1950s.
 
In 1971 Danish researchers published the results from a cross-sectional study of Inuit people living on the west coast of Greenland. They ate a fish-based diet rich in polyunsaturated fatty acids known as omega-3s, which were found in their tissues along with much lower levels of pre-β-lipoprotein and plasma-triglycerides when compared to controls. 
 
That association between a fishy diet and lowered cardiovascular risk has been replicated in multiple population studies since then and there are several ways omega-3 fatty acids could mediate the effect. They have anti-inflammatory and antithrombotic properties, lower circulating triglyceride concentrations and keep vessels impermeable to plaque forming lipoproteins.

For many years now clinical guidelines like those of the American Heart Association and the National Heart Foundation of Australia have explicitly encouraged dietary intake of omega-3s fatty acids for those at high cardiovascular risk. But such recommendations come despite considerable inconsistency in the outcomes from intervention studies on omega-3 supplementation over the past 25 years.

From several large RCTs there have been just as many negative or neutral associations as there have been positive ones. Professor Christian Hamilton-Craig has published a viewpoint review in the December edition of the Internal Medicine Journal attempting to explain these inconsistencies.

Guests
Dr Paul Bridgman MB ChB MD FRACP FCSANZ FASE (Christchurch Hospital; St George Hospital; University of Otago)

Prof Christian Hamilton-Craig MBBS PhD FRACP FCSANZ FSCCT FSCMR FACC (Director, Noosa Hearts Cardiology; Noosa Hospital; Griffith University; University of Queensland)

​Declarations of interest: nil

Key Reference 

·         Christian Hamilton-Craig, Karam Kostner, David Colquhoun, Stephen J Nicholls. Omega-3 fatty acids and cardiovascular prevention: is the jury still out? IMJ. 2023 Dec;53(12):2330-2335

Production
Produced by Mic Cavazzini DPhil. Music licenced from Epidemic Sound includes ‘Niagara’ by Chris Shards and ‘Hollow Head’ by Kenzo Almond. 

Please visit the Pomegranate Health web page for a transcript and supporting references.Login to MyCPD to record listening and reading as a prefilled learning activity. Subscribe to new episode email alerts or search for ‘Pomegranate Health’ in Apple Podcasts, Spotify,Castbox or any podcasting app.