Nerve function is the capacity of nerves to carry signals between the body and the brain rapidly and accurately, underpinning sensation, movement, and the autonomic control of digestion. Signals travel as electrical impulses along axons and cross synapses chemically via neurotransmitters. In nutrition, several micronutrients are directly tied to keeping this system working: thiamin, vitamin B6, and vitamin B12 support nerve metabolism, and deficiency can cause peripheral neuropathy, the tingling and numbness of beriberi or B12 depletion. Electrolytes matter too, since sodium, potassium, and calcium gradients generate the impulses themselves. Within the gut, the enteric nervous system coordinates peristalsis and secretions, and its crosstalk with the brain through the vagus nerve helps regulate appetite, fullness, and digestive responses to food.