You might consider replying with a thoughtful acknowledgment of their insights and perhaps expanding on or asking questions to encourage further discussion. Here's an example of how you might respond:
"Thanks for sharing these insights! I completely agree that the nervous system plays a crucial role in our mental health. It’s fascinating how the different parts of the brain, like the amygdala, prefrontal cortex, and hippocampus, contribute to our emotional and cognitive processes. I’m curious about how lifestyle factors, such as diet, exercise, and sleep, might influence the health of our nervous system and neurotransmitter balance. Do you think that making changes in these areas could help mitigate some symptoms of anxiety or depression? I'm looking forward to hearing more of your thoughts!"
This response validates their points while introducing new elements for discussion.