Alzheimer’s disease is often thought of as something that happens later in life, but research suggests the underlying changes in the brain can begin decades before symptoms appear—sometimes as early as your 30s and 40s. During this silent phase, processes like inflammation, insulin resistance in the brain, and buildup of abnormal proteins may gradually develop long before memory loss becomes noticeable. The encouraging news is that there is a lot you can do today to support long-term brain healt