HoldsUp

Sarah Marzi

Dr. Sarah Marzi is a researcher specializing in epigenomics, transcriptomics, and neurodegenerative disorders. Her published research investigates molecular and epigenetic mechanisms in conditions such as Alzheimer's disease and Parkinson's disease, focusing on microglial pathways, chromatin states, and histone modifications. She also studies the application of artificial intelligence and machine learning to dementia genetics, methods optimization, and biomarker discovery.

27 claims checked on air: 1 context 1 overstated 25 supported

What they said on air - overstated

5 citing their own research

0:30:51overstatedlowWhy Some Brains Never Get Alzheimer’s | Dr. Sarah Marzi

Vitamin D deficiency is a significant risk factor for Alzheimer's disease and accelerates disease progression in people who already have Alzheimer's.

"it's well known that vitamin D deficiency—so if you don't have enough vitamin D—is a powerful risk factor for Alzheimer's disease. And in fact, even once you already have Alzheimer's disease, vitamin D deficiency can make your course of disease faster and your progression worse." (said at 0:30:51)

While observational meta-analyses of prospective cohort studies link vitamin D deficiency to an increased risk of incident Alzheimer's disease (AD), describing it as a 'powerful risk factor' and asserting that it accelerates disease progression overstates the evidence. Meta-analyses typically report modest relative risk increases (hazard ratios around 1.34 to 1.57), and some studies show that this association is attenuated after adjusting for confounders. Furthermore, evidence linking vitamin D status to the rate of progression in established AD is primarily observational and subject to reverse causation, with randomized controlled trials of vitamin D supplementation generally failing to demonstrate substantial disease-modifying benefits.

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