Is there a difference between being thirsty and dehydrated? Like scientifically, biologically – by the time you notice that you are thirsty, are you already dehydrated?

Question

Is there a difference between being thirsty and dehydrated? Like scientifically, biologically – by the time you notice that you are thirsty, are you already dehydrated?

In: Biology

Answer 1

Here’s the thing though. I’ve always thought millions of years of evolution wouldn’t leave me feeling ok and not thirsty if I was dehydrated.

But am pretty sure I drink a glass of water a day (at most) and the rest is coffee, tea and Diet Coke. This is hardly the 5 litres a day or whatever stupid amount am supposed to drink…