Interest in dietary interventions for mental health is surging as researchers and clinicians search for new solutions to persistent psychiatric challenges. Among the most discussed approaches is the keto diet, a centuries-old nutritional strategy now experiencing a renaissance in clinical research. Once associated primarily with weight loss and epilepsy, the ketogenic diet is now making waves as a potential game-changer for severe mental illnesses. Recent scientific discoveries are shedding light on how what we eat might transform our brain health—offering hope where traditional treatments sometimes fall short.