Canola oil has been heavily marketed as a healthy choice because it is low in saturated fat.
But a new study suggests the trendy kitchen staple could worsen memory loss and learning ability in Alzheimer's patients.
It may also increase the build-up of plaques in the brain, a hallmark of the degenerative disease.
And despite its seemingly wholesome profile, researchers discovered it caused weight gain.
The findings suggest for the first time that long-term consumption of canola oil is not beneficial to brain health.