A new study indicates the debilitating “brain fog” suffered by millions of long COVID patients is linked to changes in the brain, including inflammation and an impaired ability to rewire itself following COVID-19 infection.

United Press International reported this week that the small-scale study, conducted by researchers at Corewell Health in Grand Rapids, Michigan, and Michigan State University, shows that altered levels of a pair of key brain chemicals could be the culprit.

The study marks the first time doctors have been able to provide scientific proof that validates the experiences of the approximately 12 million COVID “long-haulers” in the U.S. who have reported neurological symptoms.

Researchers looked at biomarkers in study participants and found that those........

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