Omega-3 supplementation changes the physical properties of leukocytes but not erythrocytes in healthy individuals: An exploratory trial.
Level 4 - case-series / case-control
Uncontrolled before-and-after exploratory trial with no concurrent control group.
PubMed 39159530 · doi:10.1016/j.plefa.2024.102636
What was done
Thirty-one healthy participants received 12 weeks of daily fish-oil supplementation providing 1500 mg of combined EPA and DHA. Researchers measured the Omega-3 Index (percentage of EPA+DHA in red blood cells) and evaluated the deformability of multiple blood cell types using deformability cytometry (DC) for all cell types and Laser-assisted Optical Rotational Red Cell Analysis (Lorrca) specifically for red blood cells.
What was found
Mean ± SD Omega-3 Index increased significantly from 5.3% ± 1.5% to 8.3% ± 1.4% (p < 0.001). No significant changes in red blood cell deformability were found with either DC or Lorrca. In contrast, DC demonstrated significant increases in deformability metrics in lymphocytes, neutrophils, and monocytes (resulting in less stiff cells); exact numerical values and effect sizes for leukocyte deformability metrics were not reported in the abstract.
Why it matters
This study provides evidence that dietary omega-3 fatty acids alter the physical flexibility of human immune cells, offering a potential mechanical mechanism for their circulatory and anti-inflammatory properties.
Limits
The study is limited by a small sample size (n = 31), an uncontrolled design without a placebo comparator, and a healthy population. Deformability metrics for leukocytes were not reported with exact numbers in the abstract, and functional immunological or clinical outcomes were not directly evaluated.
Cited by
- context Omega-3 fatty acids incorporate into cell membranes, making red blood cells more flexible.