Does coffee make you pee too much?

No, it does not, at least according to this post. Yes, the post is from a company that wants to sell you hydration stuff, but it feels legit. And yes, I just posted about reheating coffee and now this, so you can see where my bias is.

A recent study looked at urine volumes produced in the 2 hours after drinking a range of drinks; the fluid loss from coffee was highest.

But, the key thing that’s often not talked about is that the diuresis that coffee consumption can induce doesn’t appear to result in a net fluid loss over a longer period, when you take into account the fluid that’s absorbed and retained from the coffee itself.

This has been relatively widely researched, with many studies coming to the conclusion that, although urine output can be increased with coffee/caffeine consumption, the actual result on body fluid balance doesn’t appear to be negative overall.

This has led to there being a gradual U-turn in the scientific community on the idea that drinking coffee will compromise your hydration status on a day-to-day basis.