Tim Ferriss interviews Roblox founder and CEO David Bazuki about his family's multi‑year struggle with his son Matthew's severe bipolar disorder and how a medically supervised ketogenic diet produced dramatic improvements after many medications and hospitalizations. They discuss metabolic psychiatry, ketosis, continuous glucose and ketone monitoring, and how physiology can underpin mental health. The conversation then shifts to the origin and growth of Roblox, its user‑generated economy, safety and civility at scale, the role of AI in the platform's future, and David's own health routines and long‑term decision‑making as a public company CEO.