Scientists have long struggled to define brain fog—let alone pinpoint a cause for it. But research is starting to reveal multiple potential causes from inflammation to a leaky blood-brain barrier.

When the immune system breaks down, pollutants, toxins and other irritants are allowed into the body. This is more common with the lungs and gut, but such breakdowns happen in the brain too.

A new review highlights growing evidence linking gut health to sleep apnea, suggesting that changes in gut microbiota may influence the severity of sleep-disordered breathing.

Nearly 74% of children with autism experience gastrointestinal issues, with new research from USC showing how gut imbalances ...