#845: How to Use Ketosis for Enhanced Mood, Cognition, and Long-Term Brain Protection — A Practical and Tactical Guide with Dr. Dominic D'Agostino (Plus: Deconstructing Tim’s Latest Keto Experiment) - The Tim Ferriss Show Recap

Podcast: The Tim Ferriss Show

Published: 2026-01-07

Duration: 2 hr 22 min

Guests: Dr. Dominic D'Agostino

Summary

This episode explores the multifaceted benefits of ketosis, from its potential to enhance mood and cognition to its role in protecting the brain against long-term degeneration. Dr. Dominic D'Agostino and Tim Ferriss dissect the science behind ketogenic diets, including Tim's personal experimentation with ketosis.

What Happened

Dr. Dominic D'Agostino, an expert in nutritional strategies, discusses the broad applications of the ketogenic diet, highlighting its potential to stabilize mood and enhance cognition by lowering glutamate and elevating GABA. He explains how Tim Ferriss experienced a remarkable improvement in his Lyme disease symptoms, achieving complete remission of cognitive and joint pain symptoms within a few days of entering ketosis.

Dominic outlines the potential of ketogenic diets in metabolic psychiatry, with applications for conditions like depression, bipolar disorder, and schizophrenia. He also details how ketosis might benefit cancer patients by slowing glycolytic tumors and enhancing the effectiveness of standard care treatments.

Tim Ferriss shares insights from his personal 18-day ketogenic experiment, revealing how he achieved mood stabilization and improved cognitive function. He discusses his use of continuous glucose and ketone monitors, noting discrepancies in measurements despite feeling alert and energetic.

The episode delves into the mechanisms of ketosis, comparing breath ketones to blood ketones as indicators, and discusses how to optimize the Glucose Ketone Index (GKI) to assess metabolic health. Dr. Dominic D'Agostino highlights the importance of metabolic flexibility and its enduring protective effects against neurodegenerative diseases.

Intermittent fasting emerges as an effective on-ramp to ketosis, with Tim Ferriss following a 2-8 p.m. eating window. This approach has improved his metabolic health, demonstrated by better lab results and increased insulin sensitivity.

The discussion touches on the role of exogenous ketones, their potential benefits, and risks such as palatability and toxicity. Dr. Dominic D'Agostino warns about the risks of 1,3-butanediol, including liver toxicity and dependency, while advocating for more research and cautious use.

Dr. Dominic D'Agostino shares his personal dietary adjustments, including reintroducing carbohydrates to maintain muscle mass, and discusses the concept of 'rabbit starvation' when consuming only lean protein. The episode concludes with a tribute to Dr. Richard Veach, a pioneer in ketone ester research, highlighting his contributions to the field.

Key Insights

• The ketogenic diet can stabilize mood and enhance cognition by lowering glutamate levels and elevating GABA, which are neurotransmitters involved in brain function.
• Ketosis has potential applications in metabolic psychiatry, offering benefits for conditions such as depression, bipolar disorder, and schizophrenia, and may also slow the progression of glycolytic tumors in cancer patients.
• Intermittent fasting with a restricted eating window, such as 2-8 p.m., can effectively initiate ketosis and improve metabolic health, as evidenced by increased insulin sensitivity and improved lab results.
• Exogenous ketones, while beneficial in some contexts, carry risks such as liver toxicity and dependency, particularly with compounds like 1,3-butanediol, necessitating cautious use and further research.