Casey Means

Casey Means is an American physician and metabolic health advocate known for her work on the connection between lifestyle, nutrition, and chronic disease.

Casey Means is a Stanford-trained physician who left conventional medicine to focus on metabolic health and the root causes of chronic illness. Co-founder of the health technology company Levels, she brings both clinical expertise and a personal reckoning with the healthcare system to her writing. Her debut book, Good Energy, draws on her medical background to argue that most modern diseases — from obesity to depression — share a common origin in cellular dysfunction.

In Good Energy, Means makes a sweeping case that the food system, healthcare incentives, and modern lifestyle have combined to undermine human metabolism at a fundamental level. The book is ambitious in scope, weaving together biochemistry, public health criticism, and personal anecdote into a readable whole. Her prescription is practical: prioritize sleep, movement, whole foods, and light exposure rather than pharmaceutical fixes. The argument is not always subtle, and critics have noted that her targets — ultra-processed food, the pharmaceutical industry — are sometimes drawn too broadly.

Means writes with genuine conviction and has built a significant audience among readers frustrated with conventional health advice. Those seeking nuanced scientific debate may find her certainty occasionally overreaches the evidence, but for readers looking for a clear framework to rethink their metabolic health, Good Energy is a galvanizing starting point.