The bioactive compounds in green tea can have various protective effects on the brain.
They may reduce the risk of both Alzheimer’s and Parkinson’s, the two most common
neurodegenerative disorders.
https://www.ncbi.nlm.nih.gov/pubmed/15350981
https://www.ncbi.nlm.nih.gov/pubmed/19040558
https://www.ncbi.nlm.nih.gov/pubmed/26092629