This describes the direct, bidirectional relationship between systemic metabolic health and cognitive function. It acknowledges that the brain, despite being a small fraction of body weight, is the most metabolically demanding organ, relying heavily on stable glucose and oxygen supply. Optimal metabolic parameters, including insulin sensitivity and mitochondrial efficiency, are fundamentally required for sustained high-level cognitive performance, while dysregulation, such as insulin resistance, can directly lead to cognitive decline.
Origin
The concept emerged from the intersection of endocrinology, neurology, and gerontology, recognizing that diseases historically considered purely metabolic, like Type 2 Diabetes, have profound neurological consequences. The ‘linkage’ emphasizes that these two systems are not separate but are intimately connected through shared signaling pathways, particularly those involving insulin and various growth factors.
Mechanism
The linkage operates through several key pathways: Insulin acts as a neurotrophic factor in the brain, influencing synaptic plasticity and memory formation, beyond its peripheral role in glucose uptake. Furthermore, systemic inflammation and oxidative stress, hallmarks of metabolic syndrome, can cross the blood-brain barrier, leading to neuroinflammation and neuronal damage. Maintaining metabolic clarity ensures the brain receives stable energy and is protected from the detrimental effects of systemic dysregulation.
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