For Matt, a content editor living in the city, it crept up slowly. He was already in the habit of drinking two black coffees in the morning, chased by a caffeinated effervescent tablet, dissolved in water. Then it was Coke Zero – just a couple of bottles, when he craved it – plus a caffeine-packed pre-workout supplement on training days, three or four times a week. If he took that, he figured, then he’d have to go to the gym to burn off the energy.
“Looking at it now, that sounds crazy, but I was easily drinking 800mg of caffeine a day,” he recalls. It was part routine, part utility, part craving. The crash came later. One weekend, away at a hotel for his birthday, Matt started to feel deeply…