All our body works thanks to the nervous system, the signal came to the brain but who make the action is this system. For me is impressive how just chemical can do all the moves that we want and how this can show what we want and we don't know how. we just think and the action is there just in a few seconds.
We have a nervous system in all our body, this moves everything so even the more small part we have a lot of nervous.
Talking about the risk factors for the nervous system we can talk about the depression and we can see when our hands are shaking, dizziness, involuntary facial movement. Another form for take care your body is do exercise always when you can, preferential every day.
Talking about the food, if you want take care your system you need avoid the sugar in your food or your drinks. You need eat green vegetables, milk, nuts, honey, fish and fresh food.