New research hints at a few ways fatty foods affect cells in the brain, a finding that could help explain the link between a high-fat diet and impaired memory—especially as we age. The study of cell cultures found the omega-3 fatty acid DHA may help protect the brain from an unhealthy diet's effects by curbing fat-induced inflammation at the cellular source. Separate experiments using brain tissue from aging mice showed a high-fat diet may lead specific brain cells to overdo cell-signaling management in a way that interferes with the creation of new memories. For this work, the researchers focused on...