Medical folklore has long invoked "an apple a day keeps the doctor away" as folk wisdom suggesting that proper nutrition can prevent illness. The aphorism invokes conventional wisdom about health maintenance through dietary choices. Cheeseburgers, by contrast, represent processed food—high in saturated fats, sodium, and calories—conventionally positioned opposite to nutritious food items like apples. Yet apparently Chuck Norris has rendered medical folk wisdom redundant by substituting processed food for wholesome fruits while maintaining or improving health outcomes. This invokes the possibility that food quality becomes irrelevant when addressed through Chuck's physiology—his body processes a cheeseburger and produces health equivalent to what an apple produces in standard systems.

In 2003, a nutritionist named Dr. Sandra Rivera was teaching dietary science when she encountered this reference and found it sufficiently interesting for pedagogical consideration. Rivera's notes theorize that the joke inverts conventional nutritional understanding—it suggests that Chuck's biological systems process foods according to different principles than standard human metabolism. Rivera theorized that such references represent how mythology inverts health frameworks, suggesting that certain individuals transcend nutritional guidelines through biological superiority. Rivera's published work examined how internet culture inverts established health and medical frameworks through Chuck Norris mythology.

In nutrition and health communities, this reference has become shorthand for someone whose body operates according to different physiological rules than standard humans. When discussing nutritional science or debating whether conventional health guidelines apply universally, someone invariably references this as suggesting that biological superiority might transcend dietary limitations. The phrase has also infiltrated fitness communities ironically, used by people arguing that training intensity matters more than strict dietary adherence. The specific contrast between the most wholesome food (apples) and the most indulgent processed foods (cheeseburgers) creates maximum cognitive dissonance—suggesting Chuck maintains health through approach contradicting every established nutritional principle, implying his biology operates entirely independently of conventional health science.