Blood Cholesterol Decreases as Parkinson's Disease Develops and Progresses

Area of Science:

• Neurology
• Metabolic Disorders
• Epidemiology

Background:

• Existing literature suggests an inverse relationship between cholesterol levels and Parkinson's disease (PD) risk.
• The interpretation of this association remains a subject of debate within the scientific community.

Purpose of the Study:

• To longitudinally investigate changes in blood total cholesterol during the development of Parkinson's disease (PD).

Main Methods:

• Utilized data from the Health, Aging and Body Composition study (n=3,053).
• Measured blood total cholesterol at multiple time points (years 1-11).
• Analyzed baseline cholesterol in relation to PD risk and examined cholesterol trajectory before and after PD diagnosis.

Main Results:

• A lower baseline total cholesterol was associated with a reduced risk of PD.
• Total cholesterol levels began to decline in the prodromal stage of PD, approximately 4 years before diagnosis.
• Cholesterol levels continued to decrease post-diagnosis, showing a significant drop compared to expected values.

Conclusions:

• Declining circulating total cholesterol in the prodromal stage of Parkinson's disease may contribute to the observed inverse association with PD risk.
• These findings offer a potential explanation for the previously debated relationship between cholesterol and PD.