Scientists reveal how exercise protects the brain from Alzheimers

Exercise may sharpen the mind by repairing the brains protective shield. Researchers found that physical activity prompts the liver to release an enzyme that removes a harmful protein causing the blood-brain barrier to become leaky with age. In older mice, dialing down this protein reduced inflammation and improved memory. The discovery points to a surprising body-to-brain pathway that could inspire new Alzheimers therapies.