Caffeine's diuretic effect is less significant than commonly believed and does not necessarily lead to net fluid loss if consumed within a normal range.

“It kind of is, but it kind of isn't either. It's not the diuretic that we used to think about it as. It is still fluid consumption. So it's only a diuretic if it causes you to excrete more fluid than actually was being intake. So if caffeine intake is in a normal range, I don't have to worry about the diuretic effects.”