The Surprising Role of Cortisol in Alzheimer's
Dr. Joseph Mercola - Take Control of Your Health
Briana Mercola
4.6 • 1.6K Ratings
🗓️ 26 November 2025
⏱️ 7 minutes
🧾️ Download transcript
Summary
- New research shows that people with Alzheimer's have higher cortisol levels and a skewed cortisol-to-DHEA-S ratio, revealing that chronic stress drives early brain degeneration long before memory loss appears
- Cortisol, your body's main stress hormone, damages neurons and disrupts energy metabolism when it stays elevated, while DHEA-S acts as a protective neurosteroid that helps your brain resist inflammation and oxidative stress
- Bioenergetic researcher Georgi Dinkov connected these findings to thyroid and metabolic health, showing that when your cells don't produce enough energy, cortisol rises and accelerates cognitive decline
- Tracking your cortisol-to-DHEA-S ratio offers a powerful early warning sign for chronic stress and neurodegeneration, allowing you to take preventive action years before symptoms develop
- You can rebalance these hormones naturally by fueling your metabolism with adequate healthy carbohydrates, improving sleep and light exposure, reducing overtraining, practicing calming breathwork, and using natural progesterone to help quiet cortisol
Transcript
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| 0:00.0 | Are you ignoring the stress chemistry that may be reshaping your brain years before memory slips? |
| 0:05.0 | The cortisol to D-H-E-A-S ratio that predicts whether you're moving toward resilience or decline. |
| 0:12.0 | Welcome to Dr. Mercola's cellular wisdom. Stay informed with quick, easy-to-listen summaries of our latest articles, perfect for when you're on the go. |
| 0:20.8 | No reading required. Subscribe for free at Mercola.com for the latest health insights. |
| 0:25.6 | Hello, and welcome to Dr. Mercola's cellular wisdom. I'm Ethan Foster. |
| 0:30.6 | And today we're examining how chronic stress, metabolism, and a simple hormone ratio intersect with Alzheimer's risk. We'll look at new research, |
| 0:40.1 | what the ratio means for you, and how practical steps can shift your trajectory long before |
| 0:45.1 | symptoms emerge. I'm Alara Sky. We're grounding this in a clinical study and analysis that |
| 0:51.3 | connect cortisol, D-H-E-A-S, and cellular energy to early brain changes. |
| 0:57.8 | The aim is clarity, what to measure, what the numbers imply, in which everyday habits |
| 1:03.9 | recalibrate stress hormones toward protection rather than wear and tear. |
| 1:08.7 | A curious study of older adults compared people with diagnosed Alzheimer's |
| 1:12.6 | to healthy peers and found a clear pattern. |
| 1:15.6 | Cortisol ran higher, about 20% on average, |
| 1:18.6 | while DHEAS did not fall. |
| 1:21.6 | That pushed the cortisol to DHEAS ratio |
| 1:24.6 | upward in the Alzheimer's group. |
| 1:26.6 | The signal was strongest between ages 65 |
| 1:29.3 | and 75, pointing to a window when chronic stress chemistry accelerates damage. |
| 1:34.3 | The ratio mattered more than either hormone alone. You can have a normal cortisol reading |
| 1:39.3 | and still sit in the danger zone if DHEAS isn't balancing it. Researchers also noted sex differences in healthy adults. |
| 1:48.0 | Men tended to show higher DHEAS, but that advantage disappeared with Alzheimer's, |
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