Eating fish protects brains from air pollution, study suggests


Researchers from Columbia University in New York found that among older women who lived in areas with high levels of air pollution, those who had the lowest levels of omega-3 fatty acids in their blood had more brain shrinkage than women who had the highest levels.

In the study, published in Neurology,​ the medical journal of the American Academy of Neurology, 1,315 women with an average age of 70 were studied over three years. Researchers calculated 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. Fried fish was not included because research has shown deep frying damages omega-3 fatty acids.

“Fish are an excellent source of omega-3 fatty acids and easy to add to the diet​,” said study author Ka He. “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.”

Researchers used the women’s home addresses to determine their three-year average exposure to air pollution. The participants were then given blood tests to measure the amount of omega-3 fatty acids in their red blood cells. They also had brain scans to measure functions such as memory.

After adjusting for age, education, smoking and other factors that could affect brain shrinkage, researchers found that women who had the highest levels of omega-3 fatty acids in the blood had greater volumes of white matter than those with the lowest levels. Those in the highest group had 410 cubic centimeters (cm3) white matter, compared to 403 cm3 for those in the lowest group. The researchers found that for each quartile increase in air pollution levels, the average white matter volume was 11.52 cm3 smaller among people with lower levels of omega-3 fatty acids and 0.12 cm3 smaller among those with higher levels.

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