Depending on your body, caffeine can either be your saviour or your enemy. Some people can’t get out of bed without their morning coffee or struggle to stay alert after lunch without a cup of tea. But while caffeine is a well-accepted (and frankly, delicious) part of normal routines, the energy buzz isn’t well digested by everyone.

While you may be jealous of those who can get through the day without their caffeine fix, those who avoid the stimulant may be doing it not just for the bragging rights, but because they can experience some negative side effects from consuming it.

Levels of caffeine peak in the blood within about 15–45 minutes of consumption. People notice the strongest effects during this time, either experiencing sudden bursts of energy or feeling jittery.

If you’re one of those people who has ever gotten the shakes after coffee or stomach issues after an espresso, it could be down to intolerance or sensitivity. Here’s how your body’s reaction to caffeine can determine if you’ve just one too many cups – or there’s a sign of a bigger problem at hand?

Caffeine sensitivity: 8 signs your body could be sensitive to coffee or tea