Mental clarity can be achieved through various methods. One way is to ensure that you have sufficient electrolytes in your body, which can be achieved by ingesting water with salt or taking electrolyte supplements like LMNT. Another way is to engage in deliberate cold exposure, which can help you maintain cognitive clarity by anchoring your mind in cognitive activities. Fasting can also provide mental clarity, but it can distort your perception of the outside world. Ultimately, glucose is the preferred source of fuel for the brain, and your nervous system is extremely metabolically demanding.