Omega-3 fatty acids attenuate cardiovascular effects of short-term exposure to ambient air pollution.
Level 3 - non-randomized controlled study
Non-randomized prospective repeated-measures cohort/panel study
PubMed 35139860 · doi:10.1186/s12989-022-00451-4
What was done
A prospective panel study enrolled 62 healthy adults categorized into low or high habitual dietary omega-3 polyunsaturated fatty acid (PUFA) intake in North Carolina, USA (2016–2019). Blood lipids, vascular inflammation, coagulation and fibrinolysis markers, and heart rate variability (HRV) were repeatedly assessed across 5 sessions separated by at least 7 days. Daily PM2.5 and maximum 8-hour ozone (O3) concentrations were retrieved from nearby monitoring stations, and linear mixed-effects models assessed associations stratified by omega-3 intake level.
What was found
The abstract reports no numerical values, effect sizes, or p-values. Ambient PM2.5 and O3 concentrations remained below U.S. National Ambient Air Quality Standards. Significant associations between PM2.5 exposure and changes in total cholesterol, von Willebrand factor (vWF), tissue plasminogen activator, D-dimer, and very-low frequency HRV were detected in the low omega-3 group but not in the high omega-3 group. Similarly, O3-associated adverse changes in total cholesterol, HDL, serum amyloid A, soluble ICAM-1, and vWF occurred predominantly in the low omega-3 group.
Why it matters
This study suggests habitual dietary omega-3 intake may buffer acute subclinical vascular and autonomic responses to ambient air pollution, even at levels below current regulatory limits.
Limits
The study had a small sample size (n = 62) and an observational cohort design prone to residual confounding by general diet quality or lifestyle. Exposure was inferred from regional monitoring stations rather than personal monitors, and the abstract omits quantitative effect sizes.
Cited by
- supports Omega-3 supplementation has been shown in research to help blunt the adverse effects of air pollution.