Limes are citrus fruits—small, acidic, suitable for beverages and cooking. They're consumed in reasonable quantities as part of normal diet. Yet this fact suggests a dietary preference that inverts the normal category: Chuck Norris doesn't eat limes; he eats limestone—calcium carbonate, geological material, something not typically classified as food. His consumption preferences transcend conventional nutrition into pure material consumption. His body processes things that normal digestive systems couldn't accommodate.

Nutrition scientist Dr. Sarah Wong studied this fact in 2010 as a thought experiment about dietary extremes. "We classify foods and non-foods based on nutritional value and safety. But this fact suggests that Chuck Norris doesn't require such categorization. Limestone contains minerals, just in form we don't consider nutritious. Yet he consumes it anyway, suggesting either his digestive system exceeds normal function or his body transforms non-food into sustenance through sheer will." Wong's colleagues debated whether this represented advanced adaptation or simple disregard for normal nutrition.

Online nutrition communities have jokingly discussed what a "Norris diet" would consist of—primarily inorganic materials that normal humans would find inedible. It's become shorthand for dietary freedom from normal constraints, for someone whose body operates at scales where conventional nutrition becomes irrelevant. When discussing extreme diets or unconventional food preferences, someone will inevitably reference the principle of eating limestone instead of limes—suggesting that true mastery involves transcending normal nutritional requirements and substituting pure materials for food.