Scientists have found new early warning signs of Alzheimer’s disease that could change how doctors detect the illness long before serious symptoms appear. A large research study looked at health information from more than 11,000 people aged 57 and older. The study focused on simple blood tests that can detect toxic proteins in the body linked to Alzheimer’s disease.
Traditionally, doctors have relied on memory tests and brain scans to diagnose Alzheimer’s, often only after symptoms become severe. But this new research shows that biological clues in the blood may be useful much earlier. The toxic proteins linked to Alzheimer’s were found more often in people over 85, and much less often in people younger than 75 than scientists expected. This finding challenges past assumptions about when the disease begins and who it affects.
The study also looked at how education levels relate to the warning signs. Researchers saw higher levels of these harmful proteins in people who had less formal schooling. This supports the idea that education may help build a “cognitive reserve”, a kind of brain strength that could delay the disease.
Scientists say the research is important because the blood tests used are less invasive and easier to perform than other methods like PET scans or spinal fluid tests. These simpler tests could make early detection more widely available in the future. However, scientists caution that a positive result does not always mean a person will develop Alzheimer’s. Some people with the proteins may never get symptoms.
Another key result of the study was that there was no strong difference in the presence of these proteins between men and women. This goes against the common belief that Alzheimer’s mainly affects women, and may help scientists understand the disease more fairly across genders.
Around 11 percent of people over 70 in the study met criteria that might make them eligible for new treatments that aim to slow cognitive decline. These treatments are designed to work early in the disease process, before major memory loss begins.
Scientists hope that as research continues, these blood tests and other early warning signs will help doctors diagnose Alzheimer’s much sooner. Early diagnosis could give patients more time to prepare and to try treatments that slow the disease.
