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Cerebral Blood Flow, Metabolomics, and Early Interventions

Monday, November 30th 2020 1:08am 2 min read
The Institute for Functional Medicine instituteforfxmed

We inspire practitioners to rediscover their passion for medicine and patients to take active ownership of their health through Functional Medicine.

There is a strong connection between metabolic function and cognitive function. One complication for patients with Alzheimer’s is small vessel damage in the brain due to metabolic disturbances.1 The question is, are the risk factors for diabetes involved in causal pathways of cognitive decline, are they useful markers of cerebrovascular damage, or are they both, at least in some patients?2

In a 2016 study, researchers examined 258 men and women over age 53 for cardiometabolic risk factors.3 The results showed that 29.1% met the criteria for metabolic syndrome. Metabolic syndrome, along with sex and age, is associated with reduced cerebral conductance, a measure of blood flow through the brain. This reduction in cerebral blood flow has been confirmed by more recent studies, where reduced cerebral blood flow was mediated by arterial stiffness.4 Together, these results suggest that cardiometabolic and vascular risk factors may predict cognitive health in older adults.

Metabolomics offers another powerful tool to study Alzheimer’s as a disease of network failure. Metabolomics is the study of metabolites and their interactions, which allows for understanding of metabolism over time (rather than as a snapshot).5 Several metabolites significantly differ in Alzheimer’s patients versus control patients.6 Both mild cognitive impairment (MCI) and Alzheimer’s are associated with a pattern of distress in tryptophan, tyrosine, methionine, and purine pathways. Lower levels of these building blocks could explain the low glutathione seen in many patients with Alzheimer’s.6

Yet there is not just one type of metabolic abnormality in patients with Alzheimer’s. Rather, there are subtypes, each of which shows improvement when their metabolic markers are brought back toward a healthier range.7 These subtypes can be distinguished in clinical practice, allowing treatments to be tailored to the specific needs of the patient.7

Assessing the role of disordered metabolism, as well as the cause of that metabolic abnormality, is an increasing focus for improving cognition for these patients.8

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