Key Takeaway
MCT supplementation doubled brain ketone uptake and improved cognitive performance in adults with mild cognitive impairment
Summary
This landmark study from Dr. Stephen Cunnane's lab used PET imaging to directly measure brain ketone metabolism before and after MCT supplementation. It provided the first direct evidence that MCT oil increases brain energy metabolism in humans with cognitive impairment.
Methods
- Design: 6-month randomized controlled trial
- Participants: 52 adults with mild cognitive impairment
- Intervention: Ketogenic MCT drink (30g MCT/day) vs placebo
- Imaging: PET scans measuring brain ketone and glucose uptake
- Cognitive testing: Comprehensive neuropsychological battery
Key Results
- Brain ketone consumption doubled on MCT supplementation
- Total brain energy metabolism increased via ketone supply
- Brain glucose utilization remained unchanged
- Significant improvements in episodic memory, language, executive function, and processing speed
- Connectivity in dorsal attention network was 59% higher vs placebo
- Degree of cognitive improvement correlated with brain ketone uptake
Limitations
- Moderate sample size (n=52)
- 6-month duration may not capture long-term effects
- MCI population - results may not generalize to healthy adults
- High MCT dose may limit real-world applicability