Skipped your morning coffee? This is why you might be feeling off

If you're a regular coffee drinker, you may have experienced the dreaded caffeine withdrawal headache.

It's a painful reminder that caffeine is a drug you can become dependent on — that it doesn't just perk you up, but changes your brain in the process.

"It is addictive," says Llew Mills, a drug and alcohol researcher at the University of Sydney.

"And it has a well-established withdrawal syndrome, as most people who have tried to stop for a little while would know."

Article from ABC Health & Wellbeing