"In one study, Dutch researchers examined the diet and cognitive function of 210 men, ages 70 to 89, who did not have Alzheimer's disease. The men were assessed in 1990 and again in 1995."

"The researchers concluded that consumption of approximately 400 milligrams of omega-3 fatty acids per day (equivalent to eating six servings of lean fish per week or one serving of fatty fish per week) protects against cognitive decline."

"In the other study, American researchers looked at omega-3 consumption and cognitive decline in 2,251 white males, ages 50 to 65, who were initially assessed between 1987 and 1989. The men were checked again three and nine years later."

"The study found no association between baseline levels of omega-3 fatty acids in the men and overall
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