Casey Means is a Stanford-trained physician who left a surgical residency and decided the metabolic numbers were the plot. Co-founder of Levels, the continuous-glucose-monitor company that made “what does this bagel do to me” a consumer hobby. The book is Good Energy, a #1 New York Times bestseller. The argument: most chronic disease is downstream of broken cellular energy, and food, sleep, movement, and light are the levers, not the next prescription by default.
A CGM for two weeks will teach a lot of people more than a lecture. That is the useful Means. Walk after meals. Protein and fiber first. Ultra-processed food as the default villain. She sits next to Hyman and Attia on the metabolic floor of this site. If you already wear a glucose sensor, you have already taken the class.
She also became a political object. White House health adviser, a Surgeon General nomination that turned into a fight, MAHA-adjacent interviews. That does not make the bagel data false. It does mean her public role is now bigger than a CGM startup. Read the food chapters. Be slower with the institutional crusade, and with any claim that one sensor replaces a clinician when you actually have a disease.