Most people view salt as a dietary villain, but this essential mineral is actually the primary fuel for every action potential in your brain. When sodium levels drop, your cognitive performance and physical resilience crumble, yet the solution isn't as simple as reaching for the shaker. Discover the diabolical way the food industry uses 'hidden sugars' to bypass your salt-satiety signals and how the Galpin Equation can help you calculate your exact hydration needs for peak performance.