I don't drink any coffee or take any drugs and I don't smoke cigarettes and I don't eat sugar and I don't take any medicine at all. I eat a lot of fish, vegetables, and I stay away from starches.
Unless you have a perception of who you are as a lawyer, you will never be at ease in dealing with legal matters, clients, or courts. But if you know who you are and why you're there, all you need is the expertise and the information.