Modern Healthspan|05. Mai
If Alzheimer’s is Type 3 Diabetes, Is This Fuel The Fix? | Dr Stephen Cunnane
The 'Brain Energy Gap' and Alzheimer's as Type 3 Diabetes
Dr. Stephen Cunnane explains the concept of the "Brain Energy Gap" as a core cause of Alzheimer's disease.
- The Brain as a Hybrid Vehicle: It uses two fuels – glucose and ketones. With age, the ability to transport glucose into brain cells declines, especially in specific regions like the parietal cortex and precuneus.
- Problem: Brain Insulin Resistance: Glucose uptake drops by up to 25%, while ketone uptake remains normal. This disproves the earlier assumption that cells are simply dying and no longer need energy.
- Alzheimer's as Type 3 Diabetes: Insulin resistance in the brain creates a double jeopardy: glucose uptake is blocked, and high insulin levels prevent the production of ketones from the body's own fat stores.
- Different Transporters: Ketones use different transporters than glucose and require fewer metabolic steps (only 3 enzymes) to produce energy in the mitochondria.
- Driver of Ketone Metabolism: Unlike glucose (which is demand-driven), ketone uptake into the brain is directly determined by blood levels. This makes them perfect for therapeutic intervention.
- Therapy with MCT Oils: Supplementation with medium-chain triglycerides (MCT) demonstrably increases ketone uptake in affected brain regions and can reduce the energy gap.
- In healthy aging, glucose consumption decreases by 5-6%, mainly in the frontal cortex – possibly a sign of increased efficiency.
- In Mild Cognitive Impairment (MCI) and Alzheimer's, the decline is more severe and affects different, deeper regions (parietal cortex, precuneus).
- Conclusion: This is not a universal problem but a specific, regional energy deficit that can be specifically addressed with ketone supplements.
Core Message: The "Brain Energy Gap" is a treatable metabolic disorder – and ketones (e.g., from MCT oils) could be the missing fuel to slow cognitive decline.
Interview with Dr. Stephen Cunnane, brain energy metabolism expert
