What if your body is not breaking down because it lacks fewer calories, but because it lacks the structural materials that keep human biology stable? Built From Fat challenges the modern idea that fat is merely stored fuel or something to be burned away. Instead, it shows that fat is one of the body's primary structural resources, shaping membranes, hormones, energy systems, signaling networks, and the stability of life itself. In this book, Ian Miller explains why health cannot be understood through calories alone. He takes the reader into the architecture of the human body, showing how lipid instability, poor dietary inputs, and modern nutritional thinking can disrupt metabolism, weaken energy production, distort signaling, and drive chronic dysfunction. Rather than treating fatigue, inflammation, weight gain, and metabolic decline as isolated problems, Built From Fat reframes them as signs of deeper structural breakdown. This is not another diet book built on restriction, trends, or surface-level advice. It is a different model of health entirely. By restoring the body with the right structural inputs, the right biological materials, and a clearer understanding of how human physiology actually works, the reader will see why stability is the true foundation of energy, resilience, and long-term health.