By Dr. Liji Thomas, MD Reviewed by Lauren Hardaker Apr 8 2026 A stronger flu shot might do more than prevent infection. New research suggests it could modestly lower Alzheimer’s risk, especially in older women, offering fresh insight into brain health and prevention.   Study: Risk of Alzheimer Dementia After High-Dose vs Standard-Dose Influenza Vaccination. Image credit: Galina Sharapova/Shutterstock.com Dementia affects ~57 million people worldwide, and is incurable, highlighting the need for