<human>:  What are the health benefits of green tea?
<bot>: Green tea has many health benefits. Studies have shown that it can help protect against heart disease, lower cholesterol levels, boost the immune system, and may help protect against certain types of cancer. It can also help improve brain function, reduce inflammation, and help protect against certain types of mental illnesses, including Alzheimer's and Parkinson's diseases. Furthermore, it can help reduce risk of stroke and decrease blood pressure.