Living with chronic kidney disease can be exhausting, but for many, it also brings a hidden challenge: cognitive impairment. Research shows that about 40% of patients with chronic kidney disease experience these types of memory or thinking problems. Scientists are looking closely at how the body processes tryptophan, an amino acid that the body uses to create important chemicals like serotonin and melatonin.
When kidney function declines, the body's chemistry can shift. Inflammation can push tryptophan toward a pathway that creates neurotoxic compounds, which are substances harmful to nerve cells. At the same time, less tryptophan becomes available to create serotonin and melatonin. These chemicals are vital for mood, sleep, and protecting the brain. Additionally, certain toxins can build up in the body when kidneys are not filtering well.
While this review identifies these biological pathways as potential reasons for brain fog, it is important to note that this is a narrative review. This means the findings describe the mechanisms of how these processes work rather than results from a clinical trial. While the study suggests several ways to potentially treat these issues, these methods have not yet been tested in large clinical trials.
