Does lowering LDL cholesterol cause dementia? And how much dementia is actually “vascular” dementia versus Alzheimer’s disease?

In this video, I’m answering two viewer questions about dementia, vascular risk, statins, LDL cholesterol, and brain health. First, we look at the relative prevalence of vascular dementia compared with Alzheimer’s dementia — and why that distinction gets messy fast. Vascular dementia may be less common as a primary diagnosis, but vascular disease often contributes to cognitive decline even when the label is “Alzheimer’s.”

Then we spend most of the video on the bigger fear: whether lipid-lowering therapy — including statins and achieving low LDL-C — increases dementia risk. The short answer: no. Based on the evidence we have, lowering LDL does not appear to cause dementia, and in many patients, reducing cardiovascular and cerebrovascular risk may actually help protect the brain over time.

This is not about pretending statins are perfect or ignoring legitimate questions about brain health. It’s about looking carefully at the evidence instead of letting fear drive the conversation.

If you’re worried about statins, low LDL, Alzheimer’s disease, vascular dementia, or how heart health and brain health overlap, this one is for you.

If you missed the original: https://youtu.be/Rzz2g9gRL_8?si=z5Fcd-e8o2pYT19j

Chapters:
0:00 Viewer questions on dementia and lipid lowering
0:40 Is vascular dementia less common than Alzheimer’s?
2:00 Why dementia diagnoses overlap
3:17 The vascular contribution to cognitive decline
5:22 Why cardiovascular prevention matters for brain health
6:43 Can very low LDL or ApoB cause dementia?
8:16 Lipid-lowering drugs and the blood-brain barrier
10:14 What the overall evidence says
12:02 Randomized trials, meta-analyses, and dementia risk
13:30 Very low LDL in PCSK9 inhibitor trials
16:09 Could statins reduce dementia risk?
18:34 Midlife cholesterol and later dementia
20:00 The PCSK9 genetics question
22:15 Evidence strength: what we know and what we don’t

Are you more worried about heart disease risk, dementia risk, or the tradeoff between the two?

Disclaimer:
This video is for general educational purposes only and is not individual medical advice. Please talk with your own physician before making changes to medications or treatment plans.Sign up for more information on my own practice here: https://corsighthealth.com/

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🧬 About Dr. Lily Johnston

Dr. Johnston is a double board-certified vascular and general surgeon in San Diego, specializing in metabolic and cardiovascular prevention. She’s the founder of CorSight Health and a passionate advocate for reimagining how medicine approaches chronic disease.

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