Low Omega-3 Diets Linked to Disrupted Brain Myelin Development in Mice

This animal study looked at what happens in the brain when mice are raised on a diet lacking omega-3 fatty acids from birth through adulthood. Researchers focused on oligodendrocytes, the specialized brain cells responsible for producing myelin, the fatty insulation that wraps around nerve fibers and allows for fast, efficient communication between brain cells.

The mice deprived of omega-3s showed disrupted oligodendrocyte development and incomplete myelin formation during a critical postnatal growth window. As adults, these mice had altered white matter organization and weaker functional connections between the hippocampus and prefrontal cortex, two brain regions involved in memory and emotional regulation. These animals also displayed signs of memory problems and emotional disturbances.

Interestingly, when researchers gave the omega-3 deficient mice a compound called clemastine, which is known to promote the maturation of myelin-producing cells, the memory deficits improved. This suggests the myelin-related brain changes were at least partly responsible for the observed cognitive effects.