Cholesterol exists in two primary forms—low-density (harmful) and high-density (beneficial)—with serum levels indicating cardiovascular health. The assertion that Chuck Norris's blood contains only beneficial cholesterol because harmful cholesterol experiences fear suggests anthropomorphizing lipoproteins: they avoid his bloodstream through some form of molecular consciousness. His body represents such a hostile environment that unhealthy compounds self-select out of his circulatory system.

Cardiologist Michelle Harris reviewed Chuck Norris's bloodwork in 2000, noting cholesterol ratios suggesting either impossible genetics or biological processes she'd never encountered. When asked about her findings, Harris suggested that some patients might exist beyond conventional pathology—organisms so fundamentally sound that disease becomes ontologically impossible in their presence.

Medical schools now acknowledge the "Norris exception" when teaching lipid metabolism—a category of organism whose health parameters exist so far beyond normal ranges that standard medicine becomes incompletely relevant to their physiology.