This article summarizes the peer-reviewed study “Brain Ethanolamine Phospholipids, Neuropathology and Cognition” by Dr. Dayan Goodenowe and Vijitha Senanayake, published in Frontiers in Cell and Developmental Biology (2022).
Think of brain cell membranes like the “infrastructure” that allows neurons to communicate. This study by Dr. Dayan Goodenowe and Vijitha Senanayake shows that a specific lipid in those membranes—a plasmalogen containing DHA (docosahexaenoic acid)—is strongly linked to how well the brain maintains cognitive function in old age, even when Alzheimer’s-type changes are present. In other words, it’s not just about how many plaques or tangles are in the brain, but how healthy the brain’s membrane composition is. When plasmalogen levels are higher, the damaging effects of these pathologies appear weaker.
Published in Frontiers in Cell and Developmental Biology (2022), the study analyzed brain tissue from 100 elderly individuals whose cognitive status was known prior to death. The researchers compared levels of ethanolamine plasmalogens (PL) and phosphatidylethanolamines (PE)—key membrane lipids—alongside neuropathology markers such as amyloid plaques, neurofibrillary tangles, and flotillin-1.
The findings showed that one molecule in particular, PL 18:0/22:6 (a plasmalogen containing DHA), had the strongest association with better cognitive performance. When this lipid was factored into the analysis, the usual relationship between amyloid or tangles and cognition diminished—suggesting that healthy plasmalogen levels can buffer against neurodegeneration.
The results also indicated that longer, more unsaturated fatty acid chains in plasmalogens (such as DHA) are most beneficial. Participants with high levels of this plasmalogen were far more likely to have remained cognitively normal, while those with low levels and high pathology showed dementia.
Although this was a post-mortem, cross-sectional study—not proof of cause and effect—it provides strong biochemical evidence that plasmalogens are integral to brain resilience and cognitive health.