Fodmapeveryday iconFodmapeverydaySep 8, 2026 ~1 min source read

A blood test may reveal Alzheimer’s-related changes years before symptoms appear

What if clues to Alzheimer's disease could be found while someone was still in their 50s or 60s—and feeling perfectly fine? A new study found that Alzheimer's-related proteins in the blood were already associated with differences in memory and thinking during midlife, potentially years before dementia would normally be diagnosed.

A blood test may reveal Alzheimer’s-related changes years before symptoms appear

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What if clues to Alzheimer's disease could be found while someone was still in their 50s or 60s—and feeling perfectly fine?

A new study found that Alzheimer's-related proteins in the blood were already associated with differences in memory and thinking during midlife, potentially years before dementia would normally be diagnosed.

Researchers measured several forms of amyloid-beta and tau—proteins associated with the characteristic plaques and tangles found in Alzheimer's disease.

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What if clues to Alzheimer's disease could be found while someone was still in their 50s or 60s—and feeling perfectly fine? A new study found that Alzheimer's-related proteins in the blood were already associated with differences in memory and thinking during midlife, potentially years before dementia would normally be diagnosed. Researchers measured several forms of amyloid-beta and tau—proteins associated with the characteristic plaques and tangles found in Alzheimer's disease.

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  • Researchers are getting closer to answering that question.
  • According to the National Institutes of Health, between 4% and 15% of participants had biomarker levels high enough to suggest Alzheimer's-related changes in the brain.
  • People with higher levels of certain Alzheimer's-related blood biomarkers tended to perform worse on tests of memory and thinking.

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None had been diagnosed with Alzheimer's disease.

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