Excess caffeine harmful to health - European Food Safety Authority
Drinking more than five espressos worth of caffeine a day may be damaging to health, according to the European Food Safety Authority.
Heart problems, insomnia and panic attacks were all linked to excess caffeine consumption, the BBC reports.
The EFSA said many people were consuming more than the safe level as they were unaware of all the different sources of caffeine.
Safe limits for children and pregnant women are much lower.
Caffeine is often a crutch to help us get through the day.
Tea, coffee, energy drinks, soft drinks and chocolate are all common sources of the drug.
The EFSA was tasked with assessing all the evidence to determine safe consumption levels.
Its report says 400mg a day, in healthy adults, has no health consequences.
Around a third of people in Denmark, 17% in the Netherlands and 14% in Germany consume more than 400mg.