Insulin transport into the brain and cerebrospinal fluid.
Level 5 - mechanism / opinion, no new human data
Narrative review without systematic methodology or original human empirical data
PubMed 25817871 · doi:10.1016/bs.vh.2014.12.007
What was done
This narrative review summarizes literature examining the mechanisms and regulation of peripheral insulin transport across the blood-brain barrier into the central nervous system (CNS) and cerebrospinal fluid, focusing on the influence of diet, glycemia, diabetes, and obesity.
What was found
The abstract reports no quantitative values, sample sizes, or statistical metrics. It describes central insulin uptake as a saturable receptor-mediated process proposed to involve the insulin receptor. It notes that transport into the brain is dependent on metabolic factors and is markedly decreased in obesity, though the specific transport receptor and precise central mechanisms remain unresolved.
Why it matters
Understanding central insulin transport clarifies how peripheral metabolic dysregulation, such as obesity and diabetes, may alter brain functions including cognitive performance, energy balance, and systemic glucose homeostasis.
Limits
As a narrative review, it presents no systematic search protocol, meta-analytic pooling, or original empirical data. The abstract reports no numerical findings and highlights unresolved mechanistic questions regarding the specific transport receptor responsible for insulin entry into the brain.
Cited by
- supports When the brain develops insulin resistance, insulin has a harder time crossing into the brain.