DHA as a Master Regulator of Brain Inflammation

This narrative review pulls together research on DHA, the omega-3 fatty acid most concentrated in brain tissue, and how it influences chronic low-grade inflammation in the aging brain. Rather than looking at a single pathway, the authors describe DHA as working across several connected systems at once.

Specifically, DHA gets built into brain cell membranes, which changes how inflammatory signals are organized and transmitted. Through this membrane remodeling, DHA appears to dampen two major inflammatory switches (NF-κB and the NLRP3 inflammasome), support healthier mitochondrial energy production, and help the body generate molecules that actively resolve inflammation rather than just suppressing it.

The review also highlights why study results on omega-3s and brain health have been inconsistent: factors like a person’s starting omega-3 levels, genetics, metabolic health, blood-brain barrier function, and how long a supplement is taken can all change how much benefit shows up in a given trial. The authors suggest future studies should track these factors more carefully.