DHA is especially important for brain health
Doctors said higher levels of omega-3s lower chances for dementia, but they don’t know why.

In one study, researchers measured levels of omega-3s in red blood cells in 1,575 men and women, average age 67, without dementia. Those with the lowest levels of DHA (docosahexaenoic acid) had less brain mass—a sign of aging, and a factor in dementia—compared to those with higher DHA levels.

For all omega-3s, those with the lowest levels scored lower on visual memory tests, problem solving, multi-tasking, and abstract thinking compared to those with higher levels of omega-3s.

Overall, those with lower omega-3 levels had lower brain volumes equal to about two years of brain aging, and those with lower red blood cell levels of DHA showed a blood-vessel pattern of cognitive impairment, even though they did not have clinical dementia.

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