There is also no strong evidence that drinking water before coffee enhances caffeine’s effects. “Caffeine is rapidly and reliably absorbed after oral intake, and there is no evidence that pre-hydrating hours earlier makes caffeine inherently more potent,” says Dr. Gogol.
Hydration can affect mood and cognitive performance when someone is mildly dehydrated. But there is no evidence that drinking water before coffee provides special cognitive advantages compared with drinking the same amount of water later.
The bottom line is this: While drinking water in the morning is a healthy habit, for most adults, coffee also counts toward daily fluid intake. There is no strong evidence that you need to wait an hour or two before having your morning cup.
As hydration experts describe it, balance is key — not too much, not too little.
