Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Alzheimer's Disease Health Center

Font Size

Low HDL Linked to Memory Loss

High Levels of ‘Good’ Cholesterol May Lower Risk of Dementia, Study Suggests
WebMD Health News

June 30, 2008 -- Low levels of high-density lipoprotein (HDL), or "good" cholesterol, in middle age could increase the risk of developing dementia later in life, new research suggests.

Falling HDL cholesterol levels among study participants in their mid 50s to early 60s predicted memory declines during the same period.

Although poor memory in middle age has not been directly linked to Alzheimer's disease and other forms of dementia in old age, memory decline is key to the diagnosis of these conditions, lead researcher Archana Singh-Manoux, PhD, tells WebMD.

"Our research does not show a link between HDL and dementia," she says. "We looked at cognitive decline in midlife, but it may turn out that this decline is a risk factor for dementia."

HDL, LDL and Memory

Researchers have attempted to study HDL and other lipids like low-density lipoprotein (LDL), total cholesterol, and triglycerides in patients with Alzheimer's and other age-related dementias, but these studies have proven problematic, Singh-Manoux says.

"By the time people are diagnosed they have usually had the disease for many years, and the disease itself may have modified these lipid profiles," she says.

As a result, more and more researchers are focusing on potential risk factors for dementia that present long before the disease is identified.

This was the approach used by Singh-Manoux and colleagues from the University College London.

Their study included 3,673 civil servants enrolled in a British health trial, which included periodic analysis of blood lipid levels and testing for memory declines.

The data analyzed by the researchers were collected at two time periods -- when the average age of the participants was 55 and again when they were 61.

Low HDL cholesterol was defined as less than 40 mg/dL, and an HDL level of 60 mg/dL or more was considered high.

During the observation period, declines in HDL were found to be associated with corresponding declines in memory.

At age 61, study participants with low levels of "good" cholesterol had a 53% increased risk of memory loss compared to participants with high HDL levels.

Today on WebMD

Remember your finger
When it’s more than just forgetfulness.
senior man with serious expression
Which kinds are treatable?
senior man
Common symptoms to look for.
mri scan of human brain
Can drinking red wine reverse the disease?
eating blueberries
Colored mri of brain
Close up of elderly couple holding hands
mature woman
Woman comforting ailing mother
Senior woman with serious expression