Obesity as a catalyst for neurodegeneration

Area of Science:

• Neuroscience
• Metabolic Disorders
• Neurology

Background:

• Obesity and neurological disorders are rising in parallel, suggesting a mechanistic link.
• Midlife obesity is a known risk factor for cognitive decline and neurodegeneration, but mechanisms are unclear.
• Existing studies lack the spatiotemporal resolution and unifying framework to define the cause-and-effect relationship.

Purpose of the Study:

• To explore the mechanistic link between obesity and neurodegenerative vulnerability.
• To propose a unifying framework integrating spatial and temporal specificity of obesity-induced brain changes.
• To elucidate how chronic metabolic overload drives progressive neurodegeneration.

Main Methods:

• Review and synthesis of recent studies on obesity and brain health.
• Systematic examination of disparate mechanisms linking obesity to neural, metabolic, and vascular systems.
• Development of a framework integrating neurovascular coupling, blood-brain barrier integrity, cerebrospinal fluid dynamics, and myelination changes.

Main Results:

• Obesity induces brain-wide reprogramming across neural, metabolic, and vascular systems.
• Key affected systems include neurovascular coupling, blood-brain barrier integrity, cerebrospinal fluid dynamics, and myelination.
• A cohesive picture emerges of progressive neurodegeneration driven by chronic metabolic overload.

Conclusions:

• Obesity significantly impacts brain health through multiple interconnected pathways.
• The proposed framework offers a unified view of obesity's role in neurodegeneration.
• Understanding these mechanisms is crucial for addressing the parallel rise in obesity and neurological disorders.