Takeaway coffees bought from popular High Street outlets contain up to three times as much caffeine as those made at home, a study shows.
Consumers who drink just three or four cups a day may exceed the safe daily limit for the stimulant of 400mg, researchers warned.
Tests on more than 200 coffees bought from popular chains such as Starbucks and Costa Coffee revealed Americanos had the highest caffeine levels – averaging around 140mg per drink.
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