Hydration needs differ for athletes versus non-athletes primarily due to increased physical activity levels. Athletes require more water to replace fluids lost through sweat during intense training or competition, often needing electrolytes to maintain fluid balance. Recommendations generally suggest athletes drink water before, during, and after exercising to prevent dehydration. Non-athletes, while still needing adequate hydration, typically have lower fluid requirements. Maintaining hydration is crucial for both groups, as even mild dehydration can impair physical and cognitive performance and overall health.