A new study published in Annals Of Neurology shows that eating too much saturated fatty acid animal products not only leads to clog the arteries and an increased the risk of heart disease and stroke, but can also has a detrimental effect on brain function.

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The study drew data from the Women's Health Study, a 10-year clinical trial of 40,000 women aged 45 and up. Those who had a higher intake of saturated fat (e.g. red meat, butter, whole-fat milk and cream, cheeses, etc.) scored lower on cognitive function tests compared to those who opted for nonsaturated/healthier types of fat like olive-oil. More from The Atlantic:
The findings suggest that swapping one kind of fat for another may not only improve your cardiovascular health, but may also enhance your brain function. That's particularly important for middle-aged adults who may be at risk for Alzheimer's, dementia or other degenerative brain disorders.

"The total amount of fat intake did not really matter, but the type of fat did," said Olivia Okereke, the study's lead researcher. "Substituting in the good fat in place of the bad fat is a fairly simple dietary modification that could help prevent decline in memory."