While sugar has earned its reputation as a major health villain, salt deserves equal scrutiny. Excessive salt is well-known for raising blood pressure and straining the heart, but its damaging effects on the brain receive far less attention. Dr. Costantino Iadecola, a leading U.S. neurologist and director of the Feil Family Brain and Mind Research Institute at Weill Cornell Medicine, led a pivotal study linking high salt intake to cerebrovascular disease and dementia.
His research team fed mice a high-salt diet, observing progressive cognitive decline—including impaired memory, comprehension, and judgment. The culprit? Reduced blood flow to the brain, effectively starving it of vital nutrients.
On this diet, the mice struggled to navigate mazes, froze when their whiskers were touched, and lost interest in novel objects—hallmarks of dementia. Researchers noted elevated levels of interleukin-17, an inflammatory molecule that disrupts signaling in cerebral blood vessels. “After just three months, these curious mice developed dementia-like symptoms. They stopped recognizing familiar objects and even failed to build nests, a daily instinct,” Dr. Iadecola explained.
While these findings come from animal models, they highlight potential long-term risks for humans, especially those with existing hypertension. The takeaway is clear: like sugar and fat, salt is best consumed in moderation to protect brain health.
