Varieties of Japanese green tea. Not only can green tea improve brain function in the short term, it may also protect your brain in old age. Alzheimer’s and Parkinson’s diseases are common neurodegenerative diseases. Multiple studies show that the catechin compounds in green tea can have protective effects on neurons in test tubes and animal models, potentally lowering the risk of Alzheimer’s and Parkinson’s.
This is what the tea looked like that was dumped into the Boston harbor. This plank could roughly last someone a year. Often bought in sections, one would shave off the compressed tea into a pot/kettle.