The Real Risk of Alzheimer’s—And What You Can Do About It
By Dr. Mike
When most people think of Alzheimer’s disease, they think of age, memory loss, and inevitability. But here’s the truth: while there are some things you can’t change, the majority of what determines your brain health—especially as you age—is within your control.
We’re not just talking about crossword puzzles or fish oil. We’re talking about concrete, measurable actions that influence your risk of cognitive decline. Let’s break this down.
Two Buckets of Risk
1. Non-Modifiable Risks
These are things you were born with or can’t change—but they still matter.
- Age: The biggest single risk factor. Risk rises steadily as you get older.
- Sex: Women are twice as likely to develop Alzheimer’s as men. This isn’t just about longer life—it may have more to do with estrogen withdrawal during menopause.
- Genetics: The APOE e4 gene variant significantly increases risk. But even here, risk is not destiny. Lifestyle choices still make a huge difference.
Think of these as your terrain. You can’t change the hills or valleys—but you can choose how you travel through them.
2. Modifiable Risks
These are the levers you can actually pull. And pulling them hard matters—especially if you carry genetic risk.
- Obesity: Increases dementia risk by 60%.
- Type 2 Diabetes: Raises risk by 50%. For every 5 years with diabetes, risk goes up another 25%.
- Hypertension: Raises risk by 60%.
- High LDL Cholesterol: Every 40 mg/dL bump raises risk by 8–10%.
Here’s the kicker: if you carry the APOE e4 gene and have diabetes, your dementia risk is 5.5 times higher than someone with diabetes but no APOE e4. That’s gene-environment interaction. It’s not just one thing—it’s the stack of things.
Why This Isn’t Just Correlation—It’s Causation
There’s always been debate in medicine: is poor metabolic health really causing dementia, or is it just associated with it?
But we now have good answers:
- Randomized controlled trials show that treating blood pressure, cholesterol, and diabetes reduces dementia risk.
- Mendelian randomization (a genetic tool) supports causality.
- Mechanisms make sense: High blood sugar, insulin resistance, vascular damage, chronic inflammation—all these biological changes hurt your brain long before symptoms show up.
In other words, this isn’t just about data. It’s about biology.
What This Means for You
If you’re concerned about your future brain health—whether because of family history, menopause, or just a desire to age well—the single best place to start is your metabolic health.
At Action Medicine, we track and target these markers:
- Blood pressure: Ideal is ≤ 120/80 mmHg
- LDL cholesterol: As low as reasonably possible
- Blood sugar / insulin sensitivity: Fasting glucose, A1C, HOMA-IR, and more
Your Next Steps at Action Medicine
- Schedule a visit to review your labs and personalize your brain health strategy
- Ask us about APOE testing if you have a strong family history
- Join our metabolic tune-up program—we can help with weight, diet, and fitness that works for your life