Does Vitamin D Supplementation Slow Brain Volume Loss in Multiple Sclerosis? A 4-Year Observational Study

Area of Science:

• Neuroscience
• Immunology
• Endocrinology

Background:

• Vitamin D plays a role in immune function and tolerance.
• Vitamin D deficiency is linked to increased multiple sclerosis (MS) risk and worse outcomes.
• Evidence on vitamin D's effect on MS progression is conflicting, with limited research on brain atrophy.

Purpose of the Study:

• To investigate the association between vitamin D supplementation and disease progression in relapsing-remitting multiple sclerosis (MS).
• Specifically, to examine the impact of vitamin D supplementation on brain atrophy over a 4-year period.

Main Methods:

• A 4-year observational study of 132 relapsing-remitting MS patients (97 supplemented, 35 not).
• Assessed relapses, disability (EDSS), MRI lesions, and 25-hydroxyvitamin D levels annually.
• Measured brain atrophy using 2D measurements at baseline and 36 months.

Main Results:

• Both groups showed increased brain atrophy after 36 months.
• Patients without vitamin D supplementation had significantly greater increases in specific atrophy measures (intercaudate distance, third ventricle width, bicaudate ratio).
• Vitamin D supplementation did not impact other disease activity markers.

Conclusions:

• Vitamin D supplementation is associated with reduced brain atrophy progression in MS patients.
• Further randomized controlled trials are needed to confirm the effect of vitamin D on brain atrophy in MS.