Scientists Can Now Spot Alzheimer’s 10 Years Before Symptoms — Here’s the Catch

Picture a blood test that could tell you, right now, whether Alzheimer’s is coming for you — 10 years before your memory ever slips. No brain scan. No spinal tap. Just a vial of blood and a number. That test now exists. Researchers unveiled the findings this month, and they’re as striking as they sound. But before you rush to ask your doctor for it, you need to hear the catch. Because there’s a…