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    Breaking News

    Fish Consumption Might Protect Brains from Air Pollution

    A study in the journal of the American Academy of Neurology evaluated metrics of fish consumption, exposure to air pollution, and brain shrinkage.

    Fish Consumption Might Protect Brains from Air Pollution
    Previous researched linked omega-3s to protecting brains from exposures to lead and mercury, the researchers said.
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    07.16.20
    Omega-3 fatty acids may have potential benefits in combatting the brain aging associated with poor air quality.
     
    A study published in Neurology, the medical journal of the American Academy of Neurology, found that older women who eat more than one to two servings of fish per week may consume enough omega-3 fatty acids to counteract the effects of air pollution on the brain.
     
    Researchers evaluated the neurological outcomes of 1,315 women with an average age of 70, who did not have dementia at the start of the study, and lived in areas known to have high air pollution. Women completed questionnaires about diet, physical activity, medical history, and adjustments were made for age, smoking, and other behavioral factors that could affect brain shrinkage.
     
    The diet questionnaire was used to calculate the average amount of fish each woman consumed each week, including broiled or baked fish, canned tuna, tuna salad, tuna casserole, and non-fried shellfish, in order to approximate their average intake of omega-3s, which are associated with neuroprotective benefits. Fried fish were not included in the study because prior studies have shown that deep frying damages omega-3 fatty acids.
     
    Additionally, researchers measured the amount of omega-3 fatty acids in their red blood cells, and divided the women into four groups based on the amount of omega-3s in their blood.
     
    Researchers used the women’s home addresses to determine their three-year average exposure to air pollution. Following this, participants received MRI scans of their brains to measure various areas of the brain including white matter and the hippocampus, a part of the brain which is associated with memory.
     
    Researchers found that women who had the highest levels of omega-3 fatty acids in their blood had greater volumes of white matter than those with the lowest levels. Those in the highest group had 410 cubic centimeters of white matter, compared to 403 cubic centimeters for those in the lowest group. The researchers found that for each quartile increase in air pollution levels, the average white matter volume was 11.53 cubic centimeters smaller among people with lower levels of omega-3 fatty acids, but the decrease of white matter per quartile of air pollution was 0.12 cubic centimeters smaller among those with high levels of omega-3s.
     
    “Fish are an excellent source of omega-3 fatty acids and easy to add to the diet,” study author Ka He, MD, ScD, of Columbia University in New York, said. “Omega-3 fatty acids have been shown to fight inflammation and maintain brain structure in aging brains. They have also been found to reduce brain damage caused by neurotoxins like lead and mercury. So we explored if omega-3 fatty acids have a protective effect against another neurotoxin, the fine particulate matter found in air pollution.”
     
    “Our findings suggest that higher levels of omega-3 fatty acids in the blood from fish consumption may preserve brain volume as women age anad possibly protect against the potential toxic effects of air pollution,” He continued. “It’s important to note that our study only found an association between brain volume and eating fish. It does not prove that eating fish preserves brain volume. And since separate studies have found some species of fish may contain environmental toxins, it’s important to talk to a doctor about what types of fish to eat before adding more fish to your diet.”
     
    Since the study participants were limited to older white women, researchers said the results cannot be generalized to census-weighted demographics. Also, researchers were only able to examine exposures to later-life air pollution, while early- and mid-life air pollution exposures were not taken into account.
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