Stages of dementia are marked by declines in memory and executive function. Previous research has examined whether micronutrient levels may relate to cognitive resilience. Copper is an essential trace element that participates in neuronal energy metabolism, neurotransmitter synthesis, and antioxidant regulation. A cohort of 2,420 participants aged 60 years or older was selected from the 2011–2014 National Health and Nutrition Examination Survey (NHANES). All participants had complete data on dietary intake and cognitive function. Dietary copper intake was derived from two averaged 24-hour dietary recalls. Cognitive function was measured using four instruments: the Digit Symbol Substitution Test (DSST), the Animal...