Neurologist Dr. Leah Croll joins ABC News’ Linsey Davis to discuss the latest finding in an Alzheimer's study that indicates intense lifestyle changes could help fight early-stage Alzheimer's. --- Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7