How much water must your body loose to be dehydrated?

Dehydration occurs when the body loses about 1-2% of its total body water, which can be roughly equivalent to 0.5 to 2 liters for an average adult, depending on body size and composition. Symptoms can start to appear with as little as 1% loss, leading to increased thirst and reduced physical performance. More severe dehydration, marked by a loss of 5% or more, can result in serious health issues. Staying hydrated is crucial for overall bodily functions and well-being.