Finally, some good news if you struggle to get through the day without a coffee.. or four.
US Scientists have reviewed more than 700 studies on the effect caffeine has on humans and say consuming up to 400mg a day - the equivalent of four cups - is totally safe for adults.
The researchers say as long as we're not regularly breaching that quantity there's no need to worry about your caffeine consumption. But you have to remember not just coffee has caffeine and if you're consuming soft drinks, tea, energy drinks, even chocolate on top of 4 coffees then maybe you need to cut back.
They also recommended pregnant women keep their intake at 300mg a day, with research finding a high caffeine intake can result in an underweight baby.