Cognitive reserve is the brain’s natural resilience, its ability to adapt, compensate, and continue functioning despite the effects of brain aging or disease. People who regularly challenge their minds, through higher education, complex careers, creative pursuits, reading, problem-solving, social engagement, or lifelong curiosity, may develop greater cognitive reserve over time.

People with high cognitive reserve may be at greater risk of delayed recognition of Alzheimer’s-related cognitive decline. That’s because their brains may be better able to compensate for early damage, allowing them to maintain their cognitive abilities despite accumulating brain pathology. Rather than simply having more synaptic connections, cognitive reserve may involve using existing brain networks more efficiently or flexibly, providing a greater "toolbox" for adapting and maintaining normal function as Alzheimer’s progresses.

This ability to compensate can create a false sense of security. Even when Alzheimer’s-related changes such as amyloid plaques and tau pathology have developed, individuals with strong cognitive reserve may show few obvious symptoms. Their ability to compensate may allow them to continue performing everyday tasks relatively well, so memory lapses or other cognitive changes may not become apparent until much later.

But this compensation has a limit. As the underlying disease progresses and the brain’s ability to compensate becomes less effective, cognitive symptoms can become increasingly noticeable. By the time warning signs appear, the disease may have progressed beyond the stage at which early interventions such as Leqembi or Kisunla are indicated. Both treatments are intended for people with early symptomatic Alzheimer’s disease, such as mild cognitive impairment or mild dementia, with confirmed amyloid pathology.

My Wake-Up Call

I know this because I’ve lived it. After my diagnosis, I realized there had been clues—small moments I dismissed. Once, I told my neuropsychologist I was forgetting why I walked into rooms and struggling to find the right word. The irony? I didn’t even remember telling her that. At the time, I truly believed I’d had no symptoms.

Her words stayed with me: “You noticed changes, but you didn’t question them.”

That’s why I share this message: You are the first—and sometimes the only—person who will see the warning signs.

Symptoms to Watch For

Even if you feel fine, check in with yourself regularly. Subtle changes matter. Pay attention to:

1️⃣ Memory loss—especially with recent events.

2️⃣ Trouble planning or solving problems.

3️⃣ Confusion about time or place.

4️⃣ Difficulty completing familiar tasks.

5️⃣ Struggling with language—finding words or following conversations.

6️⃣ Misplacing things and not retracing your steps.

7️⃣ Poor judgment or risky decisions.

8️⃣ Pulling away from hobbies, work, or social activities.

9️⃣ Mood or personality changes.

Awareness Is Power

Alzheimer’s doesn’t look the same for everyone, especially in its early stages. But noticing changes—no matter how small—can make all the difference. Talk to your doctor. Ask about testing. The sooner you know, the more options you have to slow the disease and shape your future.

💡 Your brain’s strengths are powerful—but so is your ability to notice when something’s not right.