Summary
Tim Ferriss sits down with Dr. Dominic D'Agostino, a tenured associate professor at the University of South Florida, for a practical and tactical guide to using ketosis for brain health. The episode covers how nutritional ketosis enhances mood, cognition, and long-term neuroprotection, drawing on D'Agostino's research in metabolic therapies for neurological disorders and human performance optimization. Ferriss also deconstructs his own latest keto experiment, sharing biomarkers, glucose-ketone index (GKI) tracking, and practical implementation details.
Key Points
- Ketones (beta-hydroxybutyrate) are a more efficient fuel for the brain than glucose, producing less oxidative stress
- A GKI (glucose-ketone index) below 2.0 indicates therapeutic ketosis; below 1.0 is deep ketosis
- Ketosis has demonstrated neuroprotective effects relevant to Alzheimer's, Parkinson's, and traumatic brain injury
- Exogenous ketones (supplements) can provide cognitive benefits without strict dietary ketosis
- Monitoring with a CGM and blood ketone meter provides the most actionable data
- Sardine fasting (eating only sardines) is an accessible entry point to deep ketosis
- Mood stabilization is one of the most immediately noticeable benefits of sustained ketosis
- Time-restricted eating combined with a ketogenic diet amplifies metabolic benefits
