Cara T. Hoepner: Omega-3 is Not an Exposure
Cara T. Hoepner, Psychopharmacology Educator, Writer and Consultant, shared a post on LinkedIn:
“Omega-3 is not an exposure.
A recent paper associated omega-3 supplementation with accelerated cognitive decline in older adults.
A published letter from Simon Dyall and Mélanie Plourde details the missing data, residual confounding, implausibly discordant cognitive measures, absence of corresponding progression in Alzheimer’s biomarkers, and an exposure definition based on self-reported use at a single time point – with no adequate account of dose, duration, adherence, or fatty-acid composition.
This is not an isolated methodological problem. It is a recurring failure of biological resolution.
We saw it when an atrial-fibrillation signal associated primarily with high-dose pharmaceutical omega-3 in people with high baseline cardiovascular risk was translated into ‘omega-3 is bad for the heart.’
An endpoint-specific, dose- and substrate-dependent risk was generalized to cardiovascular disease, ASCVD, dietary fish, and ordinary nutritional supplementation.
But these are not interchangeable exposures. Dietary fish is not a capsule. A nutritional dose is not 4 g/day of a pharmaceutical preparation. EPA is not DHA. Reported supplement use is not an omega-3 index. A person with structural heart disease, bradycardia-dependent AF vulnerability, or concurrent beta-blockade is not the general population.
Even the newest 35-trial AF meta-analysis makes the distinction visible: the statistically significant signal appeared in high-risk patients receiving high doses, with an absolute increase under 1%. The other dose or risk strata were null, while several high-dose trials still produced cardiovascular benefits that equaled or exceeded the AF risk.
The question is not: ‘Are omega-3s beneficial or harmful?’
It is: which fatty acid, in what formulation and dose, producing what biological exposure, in which phenotype, against which endpoint, with what absolute risk and competing benefit?
When the exposure category is biologically incoherent, the headline will be too.”
Title 1: The association between omega-3 supplementation and cognitive decline in older adults
Authors: Zheng-Bin Liao, Zi-Cheng Hu, Gui-Hua Zeng, Jia Chen, Xin-Peng Li, Yu-Hui Liu, Xiu-Qing Yao, and Ye-Ran Wang
Read the Full Aricle on The Journal of Prevention of Alzheimer’s Disease
Title 2: Do methodological limitations and confounding factors explain the apparent acceleration of cognitive decline in older adults taking omega-3 fatty acid supplements?
Authors: Simon C. Dyall, Mélanie Plourde
Read the Full Aricle on The Journal of Prevention of Alzheimer’s Disease
Title 3: Effect of Long-Term Marine ɷ-3 Fatty Acids Supplementation on the Risk of Atrial Fibrillation in Randomized Controlled Trials of Cardiovascular Outcomes: A Systematic Review and Meta-Analysis
Authors: Baris Gencer, Luc Djousse, Omar T. Al-Ramady, Nancy R. Cook, JoAnn E. Manson, and Christine M. Albert
Read the Full Aricle on Circulation
Title 4: Effects of Omega-3 Fatty Acid Treatment on Risk for Atrial Fibrillation: An Updated Meta-Analysis of 35 Trials including 114 592 Individuals
Authors: Nada R. Abuknesha, James H. O’Keefe, Frank Qian, Nathan L. Tintle, Yidie Lin, Yue Sun, Han-Zhu Qian, Paul S. Aisen, Christine M. Albert, William J. Aronson, Abdul Aziz A. Asbeutah, Heike A. Bischoff-Ferrari, Matthew J. Budoff, Nicholas R. Burns, Cecilia A. Cardenas, Cynthia M. Carlsson, Emily Y. Chew, Neal J. Cohen, Léopold K. Fezeu, Amana Liddell, Pilar Galan, Mark A. Hull, Tsuo-Hung Lan, Pan-Yen Lin, Alexia Mengelberg, Anne-Marie Minihane, Joseph F. Quinn, Thomas A.B. Sanders, Andrew Scholey, David A. Schoenfeld, Kirsty Sprange, Kuan-Pin Su, Christopher H. van Dyck, Carol A. Van Hulle, David Vauzour, Claire Weber, Francine K. Welty, Gary Wittert, William S. Harris
Read the Full Aricle on Circulation: Arrhythmia and Electrophysiology
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