A new study suggests that controlled breathing and brief exposure to carbon dioxide (CO2) could help the brain clear out waste, including harmful proteins linked to diseases like Parkinson’s and Alzheimer’s. Her research focused on whether changes in CO2 levels could help move cerebrospinal fluid—the clear fluid that surrounds the brain and spinal cord—through brain tissue. However, many people with Parkinson’s disease have trouble sleeping deeply, which may limit their brain’s ability to clear out waste. These practices involve slow, deep, and rhythmic breathing, which could help move cerebrospinal fluid through the brain. For more information about brain health, please see recent studies that oral cannabis extract may help reduce Alzheimer’s symptoms, and Vitamin E may help prevent Parkinson’s disease.