Question: are you dehydrated when you're thirsty?
Answer: Thirst isn't a helpful indicator of hydration. In fact, when you're thirsty, you could already be dehydrated, having lost as much as 1 to 2 percent of your body's water content. And with that kind of water loss, you may start to experience cognitive impairments — like stress, agitation and forgetfulness, to name a few.