Scientists discover a surprising clue to why some brains resist Alzheimer’s

Why do some people stay mentally sharp even when their brains show signs of Alzheimer’s disease? Scientists in the Netherlands may have uncovered an important clue hidden in a rare group of immature brain cells. Researchers discovered that these cells remain present even in people over 80, but their behavior differs dramatically between those who develop dementia and those who remain cognitively healthy. Some people have the brain changes associated with Alzheimer's disease but never develop dementia. While others experience worsening memory and thinking problems, these individuals remain mentally sharp despite signs of the disease in their brains.

Scientists have long struggled to explain why. Now, researchers at the Netherlands Institute for Neuroscience have uncovered a promising clue. Their findings suggest that a rare group of brain cells, known as immature neurons, may behave differently in people who resist Alzheimer's symptoms. Rather than simply replacing damaged cells, these neurons could help protect the brain from the harmful effects of the disease. This remarkable ability is known as cognitive resilience. It describes how some people maintain their memory and thinking abilities even when their brains show signs of damage or disease. "Around 30 percent of older adults who