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The relationship between cholesterol and cognitive function is homocysteine-dependent.

Yibin Cheng1, Yinlong Jin1, Frederick W Unverzagt2

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Summary

Cholesterol

Keywords:
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Area of Science:

  • Gerontology
  • Neuroscience
  • Biochemistry

Background:

  • Hyperlipidemia is a potential dementia risk factor, but late-life cholesterol's impact on cognition is debated.
  • Previous research shows inconsistent findings regarding cholesterol levels and cognitive function in older adults.
  • Limited studies have investigated nonlinear associations or combined biomarker interactions affecting cognition.

Purpose of the Study:

  • To examine the relationship between lipid profiles, homocysteine, and cognitive function in an elderly Chinese population.
  • To investigate potential nonlinear and interactive effects of cholesterol and homocysteine on cognitive performance.

Main Methods:

  • Cross-sectional study of 1,889 participants from rural China.
  • Measured serum total cholesterol, HDL, triglycerides, and homocysteine levels.
  • Assessed cognitive function using a composite score from nine standardized tests and analyzed using ANCOVA models.

Main Results:

  • A significant interaction was observed between homocysteine and cholesterol levels concerning cognitive scores (P=0.0478).
  • In individuals with normal homocysteine, an inverse U-shaped association between total cholesterol and cognition was noted.
  • No significant association between cholesterol and cognitive scores was found in participants with high homocysteine levels.

Conclusions:

  • Cognitive function in the elderly is influenced by the interplay between cholesterol and homocysteine levels.
  • This lipid-homocysteine interaction warrants further investigation in diverse populations to elucidate underlying mechanisms.