“Self-tracking and self-experimentation—the core of neurohacking—are easier to do now than they have been at any other time in history. We have smartphones with apps that can log your data automatically. We have free spreadsheet tools to document our experiments. You can order many tests and interventions from the comfort of your own home. Even if you prefer pencil and paper for tracking, you can still find online communities in which to get tips and troubleshoot. Doctors are more open to self-tracking than they were a decade ago, when I first began the research for this book. That means that you can (and should!) share your findings with your doctor as you track yourself and run your self-experiments. You can provide data that can help them personalize their care for you. CASE STUDY #3: CLEARING BRAIN FOG In the late summer of 2014, Mark Drangsholt, a clinician-scientist and triathlete, gave a talk at a Quantified Self conference.8 He explained that he had complained to his doctor that he was suffering from brain fog—periods when he couldn’t remember words, forgot key information, and couldn’t concentrate. Because brain fog can have many causes and because Drangsholt seemed generally healthy, the doctor was unsure how to help. Drangsholt decided to take matters into”