Fluctuations in “Bad” Cholesterol May Be Linked to Worse Brain Health
19 Jul 2016 --- Greater fluctuations in “bad” cholesterol levels may be linked to worse cognitive function in elderly adults, according to new research in the American Heart Association’s journal Circulation.
For example, study participants with the highest LDL cholesterol variability took 2.7 seconds longer on average to finish a cognitive test to name ink colors of color words written in different ink (for example, the word blue written in red ink), compared to individuals with the lowest variability.
“While this might seem like a small effect, it is significant at a population level,” said Roelof Smit, M.D., lead study author and a Ph.D. student at Leiden University Medical Center in Leiden, the Netherlands.
In addition, greater fluctuations in bad cholesterol were associated with lower brain blood flow and greater white matter hyperintensity load – which has been linked to endothelialdysfunction.
These results show LDL cholesterol variability may be important to neurocognitive function, Smit said.
“Our findings suggest for the first time that it’s not just the average level of your LDL-cholesterol that is related to brain health, but also how much your levels vary from one measurement to another,” Smit explained.
Measurements fluctuate because of diet, exercise, frequency of cholesterol-lowering statins and other factors, he said. However, these fluctuations might also reflect an increasingly impaired homeostasis; for example, due to age or underlying disease, added J.Wouter Jukema, M.D., Ph.D., senior author of the study and Professor of Cardiology at the Leiden University Medical Center.
Researchers examined associations between LDL cholesterol variability and four cognitive measures: color-word test for selective attention, letter-digit coding to assess information processing speed and picture-word learning to test verbal memory in two ways – immediate recall and delayed recall after 20 minutes.
“These results add an important puzzle piece to the emerging evidence that vascular risk factors are closely related to brain health,” Smit said. “Our study is just the first exciting step. Further studies are needed to examine whether these findings could truly influence clinical practice.”
Smit explained to NutritionInsight: “While we observed that greater fluctuations in LDL-C were associated with lower cognitive function, it is as yet unclear what the cause is, and what the effect.”
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