A new study suggests that copper, a trace mineral found in many common foods, may play a vital role in keeping our brains sharp as we age.
Researchers from Hebei Medical University analyzed the diets and cognitive test scores of 2,420 older U.S. adults and found that those who consumed more copper performed better across several cognitive measures.
The sweet spot?
About 1.22 milligrams of copper per day—roughly the amount found in a handful of walnuts or a bowl of lentils. The findings are particularly notable among individuals with a history of stroke, where copper's brain-protective benefits may be even more pronounced.
While the study relied on self-reported dietary data, which has its limitations, it adds weight to earlier research linking copper to neuron communication and brain energy production. However, the researchers caution that more isn’t necessarily better—too much copper can be harmful, potentially contributing to oxidative stress and neurodegeneration. Still, this study underscores the growing interest in how micronutrients like copper may help slow cognitive decline in aging populations. As rates of dementia and Alzheimer’s continue to rise globally, insights like these may shape future dietary guidelines for brain health.
source
Jia, W., Zhu, K., Shi, J. et al. Association between dietary copper intake and cognitive function in American older adults: NHANES 2011–2014. Sci Rep 15, 24334 (2025).
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